ebay madness. Cannot leave bad FB

Just an FYI. I just learned the hard way that a seller cannot leave negative FB for a deadbeat bidder. Unbelievable. I sold an item, never heard from the idiot, sent several reminders.
I opened a 'non-paying bidder' case against the db, at which time the opportunity to leave negative FB disappeared (or maybe it was never there to begin with since he didn't pay?).
All I could do was leave positive FB or "leave FB later". then after I closed the case to get my final value refund, all opportunity to leave FB disappeared.
The rear-end hole non-payer gets away with the whole thing. Apparently the only thing you can do is check the "positive" button, then hammer the guy in the comments field, but I'm also told that then the deadbeat can dispute it by claiming that you clicked the wrong button.
There's no way to complain to the clueless 20-somethings that run the company so I might as well complain to you guys and wonder if anyone else chimes-in about it.