I don't see any problem with any one posting to a bug report topic, I would just prefer to be moving valid reports into the the bug report forum than having to deal with all the unsubstantiated and duplicate reports.
Here's a very simple solution that doesn't require any new forum jiggery-pokery. One you could implement now. Make the genuine, known, reproducible bugs sticky.
Do want me to go and bump all the ones that fit the bill for you? Again?
I guess there is one small problem though: you'd have at least 2 or 3 pages of sticky posts...