Nobody seems to have commented on the quality of the trackball. Is it a 2.25"? How's the TB feel?
Back in the day, Wico made those trackballs for the Atari which were, basically, wico trackballs (I think the rollers might have been slightly smaller or something) so it seems like this could be a useable item, particularly when it goes on sale for $25.
It's got to be better than using a trackball designed to be a pointing device. Nobody's opened one up yet?