I finally managed to get aireplay-ng to compile in scratchbox, after alot of cussing and driving my girlfriend totally nuts.
Anyway I loaded the rt73 driver and then iwpriv wlan1 rfmontx 1, after that I tested injection with aireplay-ng wlan1 --test, and aireplay found one AP and reported that injections worked.

I don't have the skills (yet) to make a deb package, but if anyone of you guys want to trie it out I can put up the binary files + driver.

Pardon my slightly confused post and bad english, but I have been at this this for about 9 hours non-stop.