Hence, currently when you want to ad to control groups the command is shift +0 for control group zero and so on.
The hot-key editor seems to have no problem allowing simultaneous key presses involving shift,control and alt. Space bar and other keys don't seem to be compatible with multiple key combinations. if you think of an ingenious solution i will send 10 dollars if someone gives an easy non-hacking way to fix the problem and let me try out my space grouping hot-key idea.
( ie add to control group 3 is (space +3))
summary: i want to be able to use the space bar for control groups in the same way that shift or control is currently in use.