First off, thanks for doing an emulator for a platform other than Windows.
I have a question--do you plan on supporting GD-ROM dumps?
GD-ROM dumps are .ISO/.BIN and .RAW files that are the original tracks from the GD-ROM. The only format for these so far is nullDC's GDI format. nullDC and Makaron (both for Windows) are the only emulators that support it so far.
This helps keep things on the legal side as people aren't forced to download scene releases in CDI format and instead they can use a cable/BBA to rip their own GD-ROM images and use them natively.