Ubuntustudio-lightdm-theme doesn't remember the session choice of the user, and doesn't auto-connect

If you are using the unity-greeter theme for Ubuntu:
 - it will remember your desktop choice for the next session;
 - in Unity, If you go in "Parameters / Users and accounts" and you choose auto-loging for a user, it will work at restart.

With Ubuntustudio-lightdm-theme, it will not works like that :
 - You will always have to choose your desktop;
 - Auto logging doesn't work.

A way to solve that would be to use unity-greeter as a base and just change color and background to feet the Ubuntu Studio theme.