[10intheCrunch]

That's pretty much all you can do. For more flexibility, maybe, you could use a steady analog input like the joystick wheel, or use buttons to switch between different constants that you want to test. Compile + download isn't *that* long, even if you have a bad computer. I would recommend, though, if you do have a slow comp, that you put the numbers into variables in the .c file instead of define's in the .h file, as changing a .h makes the MPLab recompile everything (otherwise f10 just recompiles files you have changed).