While the game's foot textures are already much more advanced than 99% of video games (Especially Skyrim:
http://i.imgur.com/4SC6PFx.jpg ), I would love to see slightly higher resolutions for the feet, the soles particularly. With the number of other amazing textures present in the game, I hope that request wouldn't be too difficult to consider.
Now comes the difficult one. Toe physics. It may be asking a lot, but it would be great to have a slightly bendable foot model with individual toe physics. Foot fetishism is one of the most prevalent fetishes, so this type of addition wouldn't affect an extremely small number of users. Each toe having some room to move around would work so well with the tongue addition that I believe you have planned. Again, you're already ahead of the majority of other games with your feet, adding additional physics would only secure your place at the top of the adult game world.
If it's not possible with your current resources, I understand completely. But if there is any hope, even for much later updates, I'd love to know if it could be done.