Added new setup option into the rules:
Front ARB: 0-13 //default 7
Rear ARB: 0-13 //default 6
Honestly, Anti Roll Bars are witchcraft as far as I'm concerned. They influence how much the car rolls in turns, and testing showed they have a significant impact on lap times.
Also, I've been thinking. Setup changes are one hundred percent luck, aren't they? There's only one chance to get them right, so there's no way to tell if the changes helped or hindered the car during the race.
So what I'll probably do is that the combined qualifying and race session is preceded by two twenty minute practice sessions, well before the deadline closes.
Cars that have locked down their R&D decisions are eligible to join these sessions, and changing the setup between each session is allowed. That way there's at least some method to this madness.
Edit: Apologies for the waffling around. I realize it's frustrating to try comprehending a game that keeps changing its rules, so this will be the last major addition for the season.