Two tires on rumble is legal. It's a good question because I did not clarify in OP when I said we would follow WRS rules for that specific event.
Of course the exception is the ballards. In the time trial a lap is dirty if you hit a ballard but we can't do that here (as much as I'd love to) because ultimately (or let's be realistic, by the end of lap 1) they'll all be gone anyone and subsequent runs will be without ballards.
So 2 tires on or over track and rumbles are track. Ballards are ignored. I suggest you practice without them to get used to it.
I wish the ballards were made of the tomb stone cement the used at Monza do we could keep them out if play.
But other than the ballards issue please look at the pics on the WRS-TT event linked in the OP for clean/dirty pic examples. We are going to be quite strict for qualifying.
Note: the other issue with making ballards dirty, even for lone driver quali runs is that two perspectives can show differences. We proved this at laguna when we considered making knocking over a brake marker an infraction. Turns out the driver can see the market in its original upright position while an observer watching live sees it laying flat. Has to do with the way gt5 relays positional data over network and projects between updates. Micro lag, if you will, is constantly present and can create short bubble universes... 16 drivers = 16 different observed realities. GT5 has its own chaos theory.
Ps. In response to that car color... I've seen worse. Correction, I'm wrong, that's the worst I've ever seen.