OK, I think it's time to mention what other little goodie I slipped into 4.5 ...
I have been working on being able to install my new ROMS without wiping. And it seems a few of you have had great success doing so, specifically previous SS users.
I have had reports of people coming from other ROM's (like BB) without wiping and it worked great. Also even pre-Froyo releases, but I think that's gambling a little bit.
However - I would like for you, going forward, to first install without wiping ... and then let me know if you have issues. If you do, then try the bkapps/rstapps.
Looking forward to your feedback!