First, what does the divorce decree say about pick up and drop off? If you both want to change things, you can, but at least for now, you should follow it to the letter and then after things are fairly smooth, you can approach talking it over with him if it isn't working well.
As far as him wanting to change from Tues/Wed to Tues and Thurs right after you went to court..you didn't mention the kids' ages, but how does that affect school? How does it affect discipline and their own sense of stability? If you are primary custodian, that means you are given more say in how their education, medical, etc. life goes. Still, I would want to work with him to figure out what the problem is. If he has something that happenes Tuesday nights, or Wednesdays during the day and that is the problem, can it be worked out to Wed and Thurs? What activities do the KIDS have during these days? How this affects THEM is the primary concern. If he can't manage two days in a row every week--days that ALSO work for the kids, school, homework, friends, you, and activities, perhaps he can't manage the 50-50 physical custody thing.