Since Ciro's goal in doing so is to prevent his users from ever seeing about half the work I (and many others) have put into the combined project, it *should* incur some pain. They'll never know how good the GBA driver is now, or be able to play hap's handhelds.
That's not my goal. Emu Loader is an arcade emulators frontend and it's not just for MAME. ZiNc, Daphne, Demul, Supermodel3... that alone makes it very hard to fully support MAME+MESS.
It wasn't built for console/computer. I created another frontend called EmuCon for console/handheld/computer and MESS/UME is supported.
I think the work on MESS is amazing and everyone involved are really investing in that project. I'm not trying to undermine MESS in any way.
Ciro Alfredo Consentino
EmuCon Home: http://emuloader.mameworld.info/emucon
MCM Plus: http://mcm.mameworld.info