But.........here is what I know..
#1 He is paying child support. I seriously doubt there are grounds for "abandonment"
#2 If you are getting sole custody, he still pays child support
#3 I don't think anything can show abandonment if you want to have someone adopt. sometimes the release of the burdon of child support will help convince them to sign off their legal rights. I just don't think you can force the issue while collecting support.....even if there is a amount still owing. I personally would consider it "incentive" for later, if it is in the best interest of the child.
Debi
(sorry Scott...we must have posted at the same time!
I defer to Scott..)