Apologies if you all know this one, but it didn't come up with a search.

I've been trying out Egg's trace and bevel techniques in previous threads, and I got frustated trying to get the exact settings used in the dialogs, especially bitmap tracer... until I noticed that once you click on a slider, the mouse wheel can be used to cycle up and down through the values. Further bonus- still works if the mouse pointer moves away from the slider.

Another less useful discovery- In the selector tool toolbar, where you can adjust the size and position of a selected object one unit at a time by clicking on triangle/ arrow icons, clicking with the mouse wheel will change the values by two units (instead of one).

Jess