Some good news first: the new 3-1 version, which is allegedly iOS7-compliant, can be muted. That is, we won't need to stay with version 2.47 to avoid warnings. As soon as the new MS is released and the recorder proves to survive resets, I compile a muted DEB installer.
And the bad news: I've continued playing with 3-1. Unfortunately, I couldn't find a way for it to be restored in a working state after the second reset. (After the first, if you reinstall the recorder, it'll still record calls. After the second reset, no reinstall will help, it seems, and there doesn't seem to be any way of make it record again. This all assumes you also reinstall MS after every reset, of course.)
All in all, currently, not even 3-1 works reliably. If you do depend on the tweak and still run on 6.x and aren't afraid of Apple's closing the signing window, stay with 6.x at least until MS is released and I can report on the compliance of the recorder.
And the bad news: I've continued playing with 3-1. Unfortunately, I couldn't find a way for it to be restored in a working state after the second reset. (After the first, if you reinstall the recorder, it'll still record calls. After the second reset, no reinstall will help, it seems, and there doesn't seem to be any way of make it record again. This all assumes you also reinstall MS after every reset, of course.)
All in all, currently, not even 3-1 works reliably. If you do depend on the tweak and still run on 6.x and aren't afraid of Apple's closing the signing window, stay with 6.x at least until MS is released and I can report on the compliance of the recorder.