I'll check around but yes, I think beta is the best cut-off point for this. I think you're right about the stability of OpenACS 4.x alpha vs. ACS 4.2, but then again my opinions about the quality of ACS 4.x releases is well known :)
I've just been fixing some annoying bugs in general comments which appear to have been there forever, i.e. ever notice how the "Text" "HTML" choice widget doesn't work?
