> Do you know if there is a config file or any way to point it to other folders for > roms? > > \ROMs\MAME4all\roms is currently the only place it will look.
It's been requested, but the application is created for use for MAME noobs as well as veterans. It also creates the other directories like MAME should like Artwork, Samples etc. In fact MAME4droid is the only current MAME emulator to my knowledge on Android that uses the Samples and other aspects of external files.
Btw, version 1.1.1 was released the other day with performance enhancements for low end devices.