I wasn't aware it was in the public domain, it's certainly fixed my issues, have you given it a go?

Neither 2927 I deal with is having any issues with 4.4.5.5 - so no real need.

My own 2866 is running the 4.4.5.3RC3 (from that same site) which I imagine might contain some of the same fixes (build date is Sept 6th) and that's been very stable so far.