What do you mean with player movements? The animations? Well the models are really old but its hard to find really capable modelers willing to the GPL stuff. Besides finally it would also require quite some new code to integrate better model formats. Its planned for AFTER the upcoming release though. At least at some point

The default settings are quite demanding but there is a simple way to choose lower defaults in the menu. Hell that sounds like you were quite lazy in testing

The menu got improved quite a bit already (i think) feel free to make suggestions or code further improvements.
I'd wait for the upcoming version when hosting a new server.. that should happen rather soon now that the last remaining problems got sorted out.