When it involves kids, let him get involved because you do not want to turn him away from the kids and against you.
If he pays for things, that is wonderful.
I would not get into signing this and that unless you encounter a huge problem. Some men seem to look at contracts as someone who wants to control them.
My H is still paying and it has been almost two years since he has been gone and we are not legally separated or seeking a divorce.
Of course, I am talking as someone who has not had a problem with H paying the bills on time. He has always been very prompt with paying and even goes above and beyond.
The Bomb: 08/05 H moves out: 06/2006 H moves back: 01/07 & Out again: 01/07 H moves back: 03/08 & Out again: 04/08 H moves back: 05/09 & Out again: 07/09 Divorced 08-12 Kids: 22, 20, 19