Using mouse wheel while grabing for the third axis...

Support Basics & Interface
1

im trying to find a way to do this in user preferences, but i cant find it.

I think it would be really useful (at least for me) to do this. So with mouse scroll, you move the object in X and Y axis (in screen coordinates). Since the wheel isnt used in that context, it could be move the object one unit front or back. The unit could be one grid size.

So, could this be done in user preferences?

2

What Blender has is the nudge key. It seems to be working somewhat for 2.56. In Object mode, select the object, and hit hot key [G]. You are now in nudge mode. Use the arrows to move object by increment.