We've discussed in mame2003-plus that it would be good to only add hacks and homebrews that bring meaningful changes from the versions of games that are already supported.
Some games seem to have dozens and dozens of different hacks that only make minor changes like enabling a certain cheat. That is what we realized when we were working together before.
In other words, we're willing to add 3 or 4 hacked versions of a game -- if the hacks are interesting -- but not 20 or 40.
If there are some "Best of HBMAME" hacks and homebrews in your fork that are compatible with mame2003-plus then let's try to work together to add them.
For now I spend most of my time trying to port all hacks from HBMAME of PC to my HBMAME2003 Plus and M.B.A mini Plus since we have no port of HBMAME for SBC. I have ported about 2 thousands of hacks from HBMAME. And I also decrypt and offer some hacks from a commerical emulator named YouJu. Maybe later when I am free I will try to choose some valuable hacks and add them to MAME2003 plus.
By the way, video signal on cps2 arcade machine was indeed 16:9, but the rendering was on a 4:3 screen. Rendering cps2 games as 16:9 is a bug, it was fixed on lr-fbalpha in late 2015, and was backported to lr-fbalpha2012 a few months ago.
About using the old lr-fbalpha2012 because you got the wrong roms, why not update your roms instead ? If you buy the wrong tire for your car, do you buy a new car or do you go back to get the right tire ? I can understand using lr-fbalpha2012 on a raspberry in a few specific cases (i'm mostly thinking about svg and killbld here), but lr-fbalpha is overall better because a lot of bugfix and compatibilty was added in the last 5 years.
@cyperghost In terms of speed, you won't notice the differences on a pi3, but a non-oc'd pi2, mame2003 got slowdowns and fba did not. I use lr-fbalpha for both my pi2 and pi3. As it was already pointed out, you need a different romset for lr-fbalpha. Mame2003 and fba2012's cps2 romsets will NOT work in lr-fbalpha. There was a change in the roms where it requires key files to decrypt the games now. More info on what version of romsets each emu requires https://github.com/retropie/retropie-setup/wiki/FinalBurn-Alpha
[Redacted]uses the 0.164 romset for all of their MAME files, so don't use them (none of the pi emulators use that romset, AFAIK). Giving out links to roms is a strict no-no on this board (for obvious reasons). My best advice is to learn to torrent. That's how I've acquired my MAME and FBA romsets.