To be perfectly honest, I only took a crack at it because I couldn't think of anything else that I was in the mood to work on on MAME at the time. Work was done as a direct result of me being bored as hell dovetailing nicely with an incredibly well-researched and comprehensive MT bug report.
If and when BallyAlley does decide to pay up, the only thing I intend to do with the bounty is use it to fund more LCD handheld purchases, it's certainly not going into my pocket.