That has been there since day one, not ICS specific. It's how we were getting data to (occasionally) work in the original ICS4BIONIC (CM9-based) ROMs back in February....
Surprised you didn't run across it already. If you haven't, please (thoroughly
) read Thom's stickied post at the top of this forum: Bionic Reference - Terms - Links
In it, in the first link under the show button, you'll be directed to Post Your Tips for the Bionic Here
which, in this post - Post Your Tips for the Bionic Here
- you'll see that same thing.
Thom has spend many many hours on this (I'd say cumulatively he's prolly spent well over 1700 hours on the main post, not to mention all the other contributions he has made in the other posts that he links to). You'll be amazed at what you can find in there....