Hello,
You can rate limit but you can not cap daily usage. This link talks about limit. If the controller has the function to do something, like limit an SSID, you can almost always use that in ISE. There is no feature for capping.
What you can do is open a TAC case and ask for a future request.
http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Borderless_Networks/Unified_Access/BYOD_Design_Guide/BYOD_Guest_Wireless_Access.html#pgfId-1016988
"Satisfaction does not come from knowing the solution, it comes from knowing why." - Rosalind Franklin
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