Standby sounds like a cool feature.
The only feature they had was the coin saving. Why not just remove that feature. (but I thought you redid it slightly so it would be ok for home users, but wouldn't work in a buisness... Don't remember what it was, but thought you came up with a cool comprimise... might be wrong).
Anyway, even with other apps that can do it (and other ways to do it) you should still make sure to listen to the mame teams concerns. They really try not to make bootlegging easy. Its not what they wrote mame for... and we should try and respect their feelings (since they really did so much more work then we have on our cabinets / support software).