Hi Roc, thanks for the bugs you submitted on bug-tracker, and thank you also for your feedback here.
I did tag project-manager with openacs-5-1-compat.
I do need to branch and tag the stable releases.
So far, there has been only one datamodel change between 1.0 and 1.03. Of course, there was an upgrade script. There will be future data model changes, but I don't anticipate any major changes in the short term.
I'm very interested in improving the QA of the project-manager releases, so please let me know if you have any other suggestions, or want to help out. I'm glad to hear that so many people are using it!
One thing that I think would help would be some automated test cases for project-manager. I haven't had the time to write them yet, but that would really help improve things, I think.