Quote: "Is there some trick or setting that let's the player walk on this floor plane and not be rejected by the collision setting?"
You can walk on any floor
Stairs work also there are some examples in reloaded for you to play around with
see attached
PC SPECS: Windows 8 Pro 64-bit, Intel I7 4GHz CPU, Asus R9 3GB GPU, 32GB DDR3 MEM