I've just had another idea for a small useful feature:
At the moment screenlist previews can be displayed by holding Shift and hovering over the item.
I would find it very useful if I could activate/deactivate auto-preview with Caps-Lock for example.
Caps-Lock on: Screenlist previews display automaticly on hover without pressing shift.
Could also be a On/Off switch in GUI instead of Caps-Lock.