hotkey for click attack

[cloudsalot]

Would it be possible to hotkey the click attack to space bar? I have used and abused my index finger playing games like diablo 2 and many games like it, so I know it is a long shot but I would like to give my index finger a break since i'm actively clicking and it would be easier on my hands to tap the space bar instead of clicking every couple of seconds . plus just like the guy stated for the tree cutting hot key, I play at work and tapping the space bar is not as noticeable!