I've shot & et plenty of feral rabbits from the lower '48 to NewCaledonia, to Middleton Island in the Gulf of Alaska.  They are usually more meaty than wild snowshoes or cottontails, great on the table, a bonus animal not protected by seasons or bag limits. As for mange, nasty, but manageable, just one of the negatives in our imperfect world to which we all should strive to adapt.