I always try my best to be helpful, people who have worked with me understand that. It's actually got me into trouble several times too (sharing information that hasn't been put into a released source yet is wrong etc....)
As I posted on my blog, I think iq is doing a magnificent job with FBA, and if he has any questions I can always help, a lot of the drivers he's been converting are my old drivers from MAME anyway.
As for contributing to FBA full-time is concerned, I've considered it, but, FBA is more about re-emulating what's already been emulated in MAME, rather than reverse engineering and figuring out how things work. The RE side of things appeals to me more than trying to write optimized code, which is one of the reasons MAME was more suitable to my development methodology.
I think FBA could have the potential to emulate some things (Konami GX / Racin' Force voxel based road etc.) but in reality, even if I emulated it in FBA, most of the development would end up being done in MAME where there is a debugger I'm familiar with, and developing it in MAME, then not submitting it out of spite, but instead porting it to FBA isn't really my style, so I'd rather just not look at it at all.