I came up with a way once to enter numbers in different numberboxes without clicking. Here it is. It could be adapted for bangs, toggles, sliders, radio buttons, I think just about any GUI.
The [key] object is very useful, as is the 5.reference->0_all_guis-INTRO.txt help file.
For a slider, you could have a receive object storing its value in a [float], then when the arrow keys are hit you increment this value and send it. Does that help you at all?
-Chuckk