Simple enough, is there a way to control how many particles are emitted (or other attributes), by using the weight paint? I can only make it work for hair, but weight paint doesn’t seem to affect emitted particles at all.
You can set a vertex group with weight painting and set it to influence the particle density.
Demo: http://screencast.com/t/Mi9jZalPfzgt
Whaaat, I tried that but it didn’t do anything. 
Those things only worked when I was using hair mode. Anyway thanks, I’ll have to try it again, although tomorrow because I must go to sleep now.
Got it working! 
Well, more or less. Looks like it was somehow bugged for a moment. It failed to make any difference again, but when I increased the particle size from 1000 to 2000, it seemed to reset and emit from one (blue) corner only. Then I started painting and it did nothing, but after a second of painting around or something, it started working like it’s supposed to.
Thanks again. :>