Just a few ideas from the top of my head:
Stone walls
Something between pali and brick. Will need lots of stone and common metal for corner posts. Also, walkable thicker walls if 2 or more layers thick. This should be possible in the new system and an accuracy bonus when shooting from walls.
Wolves
Standard inventory of the center and northern European forests. Tamed into dogs which can be used for territory / claim defense from small raiders or griefers. Would act in combat like a bit weaker bear. Stats depend on quality.
Swimming styles
Swimming is a pain in the ass for noobs and also sometimes for experienced people. I would suggest more skills / styles regarding swimming to make it less restraining. For example have a backstroke or breaststroke swimming for slower but less stamina consuming swimming and a butterfly stroke for quick and fast swimming, but highly stamina consuming.
I know new features like this are not that important at the moment. But if there is a possibility for them to be implemented in the future, that would be great.