diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,10 @@
+0.12.0.0
+---
+* optional configuration data (SetHo)
+* configurable: allow disabling autocommit (SetHo)
+* configurable: how to show Double/Float (default is now 'show') (SetHo)
+* redraw plots upon resetting history (PlotHo)
+
 0.11.{1,2}.0
 ---
 * make settings aware of message counter
diff --git a/Plot-ho-matic.cabal b/Plot-ho-matic.cabal
--- a/Plot-ho-matic.cabal
+++ b/Plot-ho-matic.cabal
@@ -1,5 +1,5 @@
 name:                Plot-ho-matic
-version:             0.11.2.0
+version:             0.12.0.0
 synopsis:            Real-time line plotter for generic data
 license:             BSD3
 license-file:        LICENSE
diff --git a/examples/SetExample.hs b/examples/SetExample.hs
--- a/examples/SetExample.hs
+++ b/examples/SetExample.hs
@@ -113,4 +113,4 @@
           Just _ -> putStrLn "downstream poll got msg"
         return mx
 
-  runSetter "settings" (toDData initialFoo) pollForNewMessage refresh commit
+  runSetter Nothing "settings" (toDData initialFoo) pollForNewMessage refresh commit
diff --git a/src/PlotHo/OptionsWidget.hs b/src/PlotHo/OptionsWidget.hs
--- a/src/PlotHo/OptionsWidget.hs
+++ b/src/PlotHo/OptionsWidget.hs
@@ -96,13 +96,13 @@
   resetXHistoryButton <- Gtk.buttonNewWithLabel "reset X range"
   resetYHistoryButton <- Gtk.buttonNewWithLabel "reset Y range"
 
-  on resetXHistoryButton Gtk.buttonActivated $ do
-    void $ CC.modifyMVar_ largestRangeMVar (\xy -> return (xy {xaxis = defaultHistoryRange}))
-    redraw
+  void $ on resetXHistoryButton Gtk.buttonActivated $
+    CC.modifyMVar_ largestRangeMVar (\xy -> return (xy {xaxis = defaultHistoryRange}))
+    >> redraw
 
-  on resetYHistoryButton Gtk.buttonActivated $ do
-    void $ CC.modifyMVar_ largestRangeMVar (\xy -> return (xy {yaxis = defaultHistoryRange}))
-    redraw
+  void $ on resetYHistoryButton Gtk.buttonActivated $
+    CC.modifyMVar_ largestRangeMVar (\xy -> return (xy {yaxis = defaultHistoryRange}))
+    >> redraw
 
   -- vbox to hold the little window on the left
   vbox <- Gtk.vBoxNew False 4
diff --git a/src/SetHo.hs b/src/SetHo.hs
--- a/src/SetHo.hs
+++ b/src/SetHo.hs
@@ -5,7 +5,8 @@
 -- | This is an experimental and unstable interface for
 -- generating a GUI for getting/setting options.
 module SetHo
-       ( runSetter
+       ( SetHoConfig(..), defaultSetHoConfig
+       , runSetter
        ) where
 
 import qualified GHC.Stats
@@ -23,9 +24,27 @@
 
 import SetHo.LookupTree ( newLookupTreeview )
 
+data SetHoConfig
+  = SetHoConfig
+    { enableAutoCommit :: Bool
+    , showDouble :: Double -> String
+    , showFloat :: Float -> String
+    }
+
+defaultSetHoConfig :: SetHoConfig
+defaultSetHoConfig =
+  SetHoConfig
+  { enableAutoCommit = True
+  , showDouble = show
+  , showFloat = show
+  }
+
 -- | fire up the the GUI
-runSetter :: String -> DTree -> IO (Maybe (Int, DTree)) -> (Int -> IO ()) -> (Int -> DTree -> IO ()) -> IO ()
-runSetter rootName initialValue userPollForNewMessage sendRequest userCommit = do
+runSetter :: Maybe SetHoConfig -> String -> DTree -> IO (Maybe (Int, DTree)) -> (Int -> IO ()) -> (Int -> DTree -> IO ()) -> IO ()
+runSetter mconfig rootName initialValue userPollForNewMessage sendRequest userCommit = do
+  let config = case mconfig of
+        Just r -> r
+        Nothing -> defaultSetHoConfig
   statsEnabled <- GHC.Stats.getGCStatsEnabled
 
   counterRef <- newIORef 0
@@ -81,20 +100,25 @@
 
   --------------- main widget -----------------
   buttonCommit <- Gtk.buttonNewWithLabel "commit"
-  buttonAutoCommit <- Gtk.checkButtonNewWithLabel "auto-commit"
   buttonRefresh <- Gtk.buttonNewWithLabel "refresh"
   buttonTakeUpstream <- Gtk.buttonNewWithLabel "take upstream"
   Gtk.widgetSetTooltipText buttonCommit
     (Just "SET ME SET ME GO HEAD DO IT COME ON SET ME")
-  Gtk.widgetSetTooltipText buttonAutoCommit
-    (Just "Send settings upstream as soon as any value is changed")
 
+  mbuttonAutoCommit <-
+    if enableAutoCommit config
+    then do buttonAutoCommit <- Gtk.checkButtonNewWithLabel "auto-commit"
+            Gtk.widgetSetTooltipText buttonAutoCommit
+              (Just "Send settings upstream as soon as any value is changed")
+            return (Just buttonAutoCommit)
+    else return Nothing
+
   -- the options widget
   options <- Gtk.expanderNew "options"
-  Gtk.set options [ Gtk.containerChild := buttonAutoCommit
-                  , Gtk.expanderExpanded := True
-                  ]
-
+  let mautocommitChild = case mbuttonAutoCommit of
+        Nothing -> []
+        Just buttonAutoCommit -> [Gtk.containerChild := buttonAutoCommit]
+  Gtk.set options $ mautocommitChild ++ [Gtk.expanderExpanded := True]
 
   -- how to commit
   let commit val = do
@@ -105,8 +129,11 @@
         userCommit counter val
 
   -- the signal selector
+  let getAutoCommitStatus = case mbuttonAutoCommit of
+        Nothing -> return False
+        Just buttonAutoCommit -> Gtk.toggleButtonGetActive buttonAutoCommit
   (treeview, getLatestStaged, receiveNewUpstream, takeLatestUpstream, loadFromFile) <-
-    newLookupTreeview rootName initialValue (Gtk.toggleButtonGetActive buttonAutoCommit) commit
+    newLookupTreeview (showDouble config) (showFloat config) rootName initialValue getAutoCommitStatus commit
 
   treeviewScroll <- Gtk.scrolledWindowNew Nothing Nothing
   Gtk.set treeviewScroll [Gtk.widgetVExpand := True] -- make sure it expands vertically
diff --git a/src/SetHo/LookupTree.hs b/src/SetHo/LookupTree.hs
--- a/src/SetHo/LookupTree.hs
+++ b/src/SetHo/LookupTree.hs
@@ -19,7 +19,6 @@
 import qualified "gtk3" Graphics.UI.Gtk as Gtk
 import System.Glib.Signals ( on )
 import Text.Read ( readMaybe )
-import Text.Printf ( printf )
 
 data FieldElem =
   FieldElem
@@ -153,12 +152,14 @@
 
 
 newLookupTreeview ::
-  String
+  (Double -> String)
+  -> (Float -> String)
+  -> String
   -> DTree
   -> IO Bool
   -> (DTree -> IO ())
   -> IO (Gtk.TreeView, IO DTree, DTree -> IO (), IO (), DTree -> IO ())
-newLookupTreeview rootName initialValue getAutocommit commit = do
+newLookupTreeview showDouble showFloat rootName initialValue getAutocommit commit = do
   treeStore <- Gtk.treeStoreNew [] :: IO (Gtk.TreeStore ListViewElement)
   treeview <- Gtk.treeViewNewWithModel treeStore :: IO Gtk.TreeView
 
@@ -222,8 +223,8 @@
 
   -- upstream
   let showField :: DField -> String
-      showField (DDouble x) = printf "%.2g" x
-      showField (DFloat x) = printf "%.2g" x
+      showField (DDouble x) = showDouble x
+      showField (DFloat x) = showFloat x
       showField (DInt x) = show x
       showField (DString x) = x
       showField DSorry = ""