Combat tails only roll the DX+skill check one in three times. Activate them to hold your tail in attack position, draining stamina (hunger/fatigue IIRC) and forgoing any dodge bonus you may have gotten from a Thick Tail, but rolling the attack every turn.
Hiding in your Roomy Shell is basically a portable, armored, tent/rollmat combo. You can’t do much when in it though.
Rat burrowing is pretty much a more efficient pickaxe for lateral digging; construction requirements are JSON’d so I’m not sure how to have it check traits.
Slimesprings are cute and you should totally have some. 
Hibernate was rigged to let you sleep for 10 days at a stretch, but it needs some maintenance and nobody seems to use it, so back-burner. :-/