With the Warfarin, the mouse has enough strength to crawl back into the wall or some other hole you can't get to, where it curls up and dies, rots and stinks the place up.

Having had to deal with the mouse-in-camp problem, I'd go with SRS's suggestion. We used to leave a plastic garbage pail in our camp, but we started making sure it was covered over or upended after finding mice in the bottom of it every time... some still alive and some dead and partially eaten. I hate having the little buggers in the camp destroying things and shitting all over, but not enough to want them tortured to death.