1. 1-2 for defensiveness. They are hair kickers more than anything
2. Fast
3. No. They like their burrows, but come out often
4. Good feeders
5. Hardy
6. Depends on the size of the critter keeper
7. Yes. Maybe add cork bark half tube for a burrow. and a water dish (which will get buried anyway)
8. Yes

If you keep old worlds already, B. vagans is a breeze to keep.