Yes I plan to add octopus tentacles and slime tentacles, as well as horse cock and normal penis (goblin and human). They are part of patreon voting and possibly the next free discord voting
Regarding the penetration movement, I believe advanced tentacles shaders gives a little more movement. I still want to add some extra movement to the penetration, but have a little work to do figuring out how to sync it with th other animations.
Also thinking about manual controlling the tentacles, but that is a little further out