Ah, that makes since.
I mean, I do the same thing with 360Chrome - use v11 for 99% of the time, use v13 for 1% of the time.
So I would be happy with a stable release Mypal 68 for 99% and 78/91 for 1%.
I'd go so far as using an "abandonware" version of Mypal 68 (I "hate" weekly updates!) once it becomes "stable".
I'd be okay with Feodor's experiments releasing three versions then abandoning 68 if he finds that 78/91 is his future - because I don't think he's looking to "constantly update" all three.