I think we're going to see a lot of community made custom builds like they have for Android once Meego is released

IMO it's a good thing but comes with consequences. Any pre-compiled binary should never be fully trusted, and that even goes for the packages on extras. Honestly using PR1.2L is about as dangerous as doing that... Every time you install something from extras you technically are taking the same risks as installing the leaked firmware. The app manager gives full access to rootfs and can delete battery stuff, install a new kernel, dial 900 numbers, steal passwords, etc. You can literally destroy your device simple by installing one app.

Most of us are just too lazy, don't want to wait, or don't know how to compile from source. I fall in at least one of those categories, not wanting to wait. But in this case, I'd wait to see if there's a timer in PR1.2L before I consider using it.

P.S.:
This post is not meant to encourage anybody to attempt anything malicious with the extras repo and if you try it I'm sure someone will find you and KILL YOU!