FIB, get him a cell phone, who cares if she is going to be furious. And you know how I feel about her as a parent. Shameful.
I dont think you should 'tell' him to tell his mom his wishes. But I was curious if he mentioned to you that he wanted to drive with you.
FIB, you know what, just enjoy the day with your son as best you can. Until you are out of this impossible situation of living together, you should make it as easy as you can on your children. However, please try to get your lawyer to move on some things. Someone needs to push the LG along here, for goodness sake. These kids are being damaged and it should not be ok. Do what you have to within the judicial system to get them protected.
On another note, how can I be friends with a freakin' Met fan?