Having missed adequate lead sheet/notation features in BIAB for a long time, I now learned to concentrate on the strenghts of the software (which are a lot !) while doing all notation stuff with another one - Musescore (http://musescore.org/) - it's free and absolutely suitable for my needs.
Being able to import BIAB.SGU - files, it's very easy to use with BIAB and the results are great.
So I hesitated not a second to upgrade to BIAB 2012 (mainly because of the new RealTracks) and I appreciate if BIAB will improve its unique characteristics while leaving notation etc. to others.