I would be happy to add later drivers to if I knew what problem they solved, and where to get the source of the drivers. Lr-mame2003 is open source so anyone is welcome to update it. is what someone with the skills should do for the RPI to make reteopie even better.
What they did with Coinops for the old Xbox which has added a lot of the fixes and newer games while still using an older M.A.M.E. It's a damn shame no one at retroarch updates the drivers for mame2003 as there has been a lot of corrections and new games added since 2003 that can easily work on the RPI that can make it the best M.A.M.E. The FBA part of retroarch pretty much gets updated to the latest release of FBA which is great for updated drivers but also shows stuff that's still beta and doesn't really run at all (MK2-UMK3). Said in Romsets between Mame and Final Burn Alpha:
