While you wouldn't be able to remove the dials, it would be possible to write a script to do as you describe. There are a number of was to implement this but, just off the top, it could work like this. Have a script that would let you select, by name, the dials you want to work with in the scene. The script then opens a small window with the selected dial values displayed as you described. A small button label '+', the value and a small button labeled '-'. You could probably but two of these on the panel in the same space as one standard dial.