I put a visitation question up today, too!
STBXH/Perv is a very electronic-oriented person and DD has complained of similar things as your kids.
One thing that I did a few years ago that she liked was to get a video game setup. It's not ideal, but gets them "Playing together".
The other thing she does is ask him herself, "What do you want to do, dad?" And she tries really hard to do that-help with a chore, ride bikes, watch some parts of his movies instead of hers...
It's hard to engage an adult for kid sometimes, I think.
And I know there are the opinions who say we should stay out of it, but I feel the way you do and try to have limited input-just mentioning that to her and not to him if she complains she was bored. She told me she gets movies put on over and over for a lot of the time, so it also makes me work extra hard when it's my turn.
I don't know if that will help any.
A person is a person, no matter how small. -Dr. Suess
Perserverance and spirit have done wonders in all ages.