The default spot for the savegames/states is /home/user/.gnuboy/saves/

Sorry I'm not going to have much time to add features for a while. However I'll try and post the source up tonight so anyone else who wants to add stuff can.

[EDIT] Here's the source:
http://chaoticbob.nfshost.com/maemo/...-0.9.14.tar.gz

I would reccommend not messing with the debianization as all the files are copied manually so you'll lose that if you aren't careful.