You just mod the game interface to have a crosshair, and then you make it so when you acquire one of those items that shoot things it creates a dummy unit (That's flying, I dunno the height it depends on your camera) and then you move it forward until it hits something.
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.