cute little buggers they are,
what I would recommenced is putting skewers or a mini garden fence around the garden.. if i were you i'd put skewers up pointing at a 40 degree angle so they don't squeeze through but i am assuming that is tedious.

i doubt they would attempt to come into your house, they don't prefer that environment..

if you got hawks or eagles around your area they can do some help by wiping out the rodents.. i wouldn't know much about habitat modification though.