I use WCS to create guest accounts on a WLC4400 local database. Guest login works fine but i can login with any guest account on any campus, building, floor even if the account is apply only on one of those.
i use a custome Web auth page, this is the cisco's exemple page with our logo.
WLC44000 - 188.8.131.52
WCS - 4.262.11
WLAN Guest setup :
Layer 3 security : none
Web policy : authentication
Over-ride global - config enable