I just discovered that one of my co-contributors at the Arcana Wiki is working on a Random Crime Generator - which you should all check out, because it's pretty awesome. It's not specifically for Shadowrun campaigns (or cyberpunk in general), but you should be able to get some use out of it nonetheless.

It's still a bit in its early stages, though - so feel free to help him out in expanding it. He explains how further down the page.