Challenge: a tiny auto hot key script (or a program) that clicks the left mouse button automatically when it's held in place for more than a set interval of time. It must be possible to set the interval somewhere, and to set the distance the pointer has to travel before it autoclicks (if you move it 3 pixels by accident, you obviously don't want it to auto-click). You don't want to get a autoclick if you move the pointer somewhere and left, right or middle click. It would be very good to suppress by holding a definable hotkey (shift?), and to turn it off easily and definably (ctrl-d?). It would be good to have a tray icon that shows very clearly, in different color, whether it's active or not.
Why #1. Most of fatigue from using the mouse comes from clicking. I used similar program and in my experience it did help a lot. It simply feels like it's two times easier to work.
Why #2. It makes you more conscious of how you work. You stop moving mouse aimlessly around. If you do, you get stung
At first it's a bit annoying but later on you find that it teaches you to discipline yourself to know what you want to do before doing it.
Why #3. It sometimes help to slow you down if you rush too much. You can control this effect by changing the autoclick delay. I've found that usually 0.3 sec works best for me, if I set it to .6 or .7, it feels a little slow for work but sometimes it has a relaxing effect, and this may be a good thing if you're not trying to meet a deadline..
Notes: There is a tiny freeware app that does just this, but it's unusable because it autoclicks even if you right-click somewhere. On top of that, there are no options or settings. I tried to find that program but search did not turn it up.. I've seen it about a year ago.
There is an autoclick in RSIGuart program. It's very useful and functional, but RSIGuard itself is $45, autoclick is only a tiny part of it and it does not let you temporarily suspend its action by holding a key. I'd probably buy it anyway but I'm a little short on money right now
The link to that feature on their site is:
www.rsiguard.net/help/helpac.htm 
