I've added disk writing support, as I've now been able to test it a bit (using workbench). Chui's code was already there, but there were a few things I wanted to investigate and fix before release.
Version 0.6.4 is now available with this change:
http://criticalhippo.googlepages.com/uae4allgp2x
Auto save is ON by default. This means that if a program writes to disk, its changes will be saved in a file in the new "saves" directory that should be rooted in the same directory as the uae4all.gpe file.
I've also changed the default sound option to be ON now.
I'm looking to move the settings to be persistable, and hope to do that when key mapping is complete.
TomVS: I'd appreciate it if you could try this new version to see if it saves in WINGS for you.
Note that this new version does not feature 'save states', which are a completely different thing.