Not yet, since I only started the job 8 weeks ago. I guess instead of just quitting, I should ask them if they have any other ideas for me. 3 days a week would be great...
One big lesson I've learned is that if you want something out of the ordinary, no one is spontaneously going to give it to you. You have to explicitly ask for it. And when you do, it's surprising how often you get a positive response.