You don't have to start a thread on every single tiny issue that you become aware of. You could have just PMed it or at least start it in support.
Mentioning bugs in the forums is useful. Often, the community can propose fixes/workarounds and the issue can get attention from developers. Support will help with lots of issues, but can't really fix bugs in the game itself.
I was wondering about this! I tried really hard finish up my classic PA achievements. But those spectate achievements only incremented once and afterwards never again. So what do you exactly have to do to earn them? Will the counter increase when you join a game in progress? Will it only increase when you spectate a game from the beginning? Are AI allowed? etc. etc. I hope that all spectating will be allowed so I can finish them quickly and move to TITANS!!