I think it would be good to trial that. I know your anger towards him, but a father wanting to be with his kids is a good thing. This will be a change in their routine, but I honestly think the benefits out weigh the risks.
Give him a chance. It's not extremely disruptive as this is the routine of many many many divorced parents. My ex gets one night a week. he lives 25 minutes away from her school. His wife drives her to school. Heck, I tried to get him to take 2 more nights a month, but he finds it's too disruptive to his routine (insert eye roll).
I don't think he expects you to jump to his demands. Seems that way when you are angry with him. He said he would like to spend more time with his kids. And that benefits your kids. Try taking you out of the equation, and think about the benefits of your kids spending more time with their father and them not growing up thining he's the guy who takes them to mc Donald's on Tuesday night. You may think that's what HE deserves, which he very well might. But it's not what your kids deserve.
Try not to make it about YOU the best you can.
I say all of this from experience. I've been in your shoes, I've felt like you have and I realize the only person I was hurting was me and my D.
