Player settings can be set from "Player Settings" menu. They're essentially the same as appropriate properties for enemies or decorations.

Speed - sets a speed movement of player.

Radius - sets a radius of player collision. Try to keep it lower than 64 unless you want to not being able to get through the doors.

Viewbob Scale - sets amount of viewbobing of the camera and weapon while moving.

Height - sets a player's height.

Sounds can be imported through "Import Player Resources" menu.