you prolly know this already, but just for the record, i'm using release h from an obs repo: nestopia-1.40rh-2.1.
i hope you will keep it though! if you don't want to develop it further, then hopefully, for the next release, you will apply the fix above and leave the cheat manager at that. considering that thought, perhaps you could make a "Release I" now with this fix?
i also noticed that the surround option in the audio tab doesn't stick between sessions of nestopia. is that on purpose or perhaps a bug?