Thanks for responding.
Tested now with: Version 0.8dev vom 02.02.2017
It is easier to assign thumbsticks now but I still can't assign more than 4 XBox360 controllers, this is probably because Rewired is set to use XInput instead of DirectInput for these devices.
Also in the test version I am unable to add a player using an XBox360 controller. When I add the user with the keyboard I am unable to control the character with the game pad..
I am however able to add and control a player with a non-XInput controller.