Alrighty, I got to test for a little while. OS2SD sounds like a great idea in theory.
It makes me very nervous though. Here's my thoughts: If you boink (got that from this thread) you ROM, it's fine, you just fall back on your recovery, if you boink your recovery, it's fine if you have a good ROM to fall back on. With both your recov flashing and ROM flashing, there's no fallback. It makes me nervous mostly because this is my only phone.
So anyway, I tried it, it failed. I was too freaked out by it failing to try to copy a log or anything, so it's really a fruitless test. But a test nonetheless. Maybe in a few years when I save up enough money to get another phone, I can really go nuts with my wife's and my OS's, but for now, it terrifies me.
I'm back on my old stable Slimbean 3.1.0. Nothing but a thing jelly bean. I did however, make a backup and started making tweaks trying to see what I can root delete out of Kraven's version of KK.