I implemented true unlimited caps for the classes and characters in a raid. If you put a "*" or "unlimited" or leave the field blank for max characters or one of the class max fields then that field has an unlimited cap.

So if you have a raid with a Mages and Warriors in it. The max for mages is 2 and the max for warriors is unlimited and the character max is unlimited. Then only 2 mages can sign up but any number of warriors can.

Now if we create a new raid that has wars, mages, and priests. The priests have a max of 6 and the mages and wars have an unlimited max and there is a 30 character max for the raid. Now only 6 priests can sign up, but any number of mages and warriors can sign up. Once the raid has hit 30 signups then no more characters can sign up even though there is an unlimited cap one or two of the classes.