My 2 year old goose is outside during the day and comes in at night-time. She seems to have fun doing her goose-stuff, she plays in the water and eats any green thing that comes up, and then at bedtime she comes in and sleeps with me. Since we got chickens and ducks she also chases them if they get too near her nest.
When she's inside all the time like when we're on a trip she tends to pull her diaper off and chew on more stuff (diaper always stays like I put it on at home), so I don't think I would try to keep her inside all the time. This might just be because she doesn't have toys or anything at times like that, though. I am concerned about her getting bored or lonely though, I'm hoping that when the baby is big enough to go out with her they'll get along.
I change baby diapers some, and Sticky wears a diaper inside. The goose diapers, even when she's gotten into catfood or something, are not half as smelly, and they're a lot easier. As long as you're not afraid of some digested grain and grass, you shouldn't have any problems.
Also, I've used diapers from thegoosesmother.com, with the over the head and straps instead of a panel in front (indoorducks.com also has this kind, but with a plastic liner), and they're great. Easy to change, easy to put on, just easy. The gosling diapers are also nice, though it's not much of a problem then for a few weeks at least. But, I got a cheap diaper for my cockerel that you actually have to put their legs and wings into, and it's hard to change and really hard to put on, even on the baby goose who's used to diapers and tends to help me with it. So I suggest paying the $20-$30 for that kind of diaper.