In reply to Zachary Skaggs.

I've got two ideas that might solve your problem. The second one would be by far, the faster to implement and use right away:

1st idea - You (and all of us too!) should suggest wordpress.org forum dev teams to add a 'secret field' in the support threads. I don't know if you know how vBulletin support forums work? Their support threads work as any other forum in the internet, but they also feature in every single support thread, a "private field" where only the support member and the customer who starts the support thread have access. That is the place to put URLs, user names, ftp addresses, licence numbers, or even (temporary) passwords!

[The only problem I find with this idea if the fact that wordpress.org changes only get fast implementations when Matt Mullenweg is the author of those ideas... :p ]

2nd idea - (This is faster to do) I agree with you when you state the different treatment that plugin authors receive when compared with bbPress and BuddyPress, but you could just start going to your wordpress.org plugin forums once a week and start responding to support threads.
On some of the support answers, I believe that giving a kind of "canned message" to your plugin users stating that if they want better support, they should go to your support website and start a support thread in there would be just fine.

There you go!
No more unanswered threads.
No more bad ratings from your plugin users.
And more popularity to your plugins in the repository.