In my case my wife is still the primary caregiver. We agreed on more visitations for me. I am okay with the schedule now.
In your case, unless i understood wrong, you are asking for sole custody. Yup that legal language can be hard. I should know. I was at the receiving end of it.
I dunno, maybe you can talk to wife to see if she's willing to come back to your town. Then you would not have this issue.
See in my case my wife badly wanted to be close to her family.
I'd say, try to get more suggestions before you tell her.
BITS M 38 W 36 D 7 Married 15 yrs W left for 6 months in 2009 W Filed for D 01/03/11 piecing now...