AM2634: Use additional functionality in the RTI module when it is assigned as the "Clock" for a core

I'm configuring an application that uses all four R5F cores independently.  In SYSCONFIG, each core is automatically assigned an RTI instance for the clocking.  However, the Clock configuration in SYSCONFIG only allows the timer tick to be set up.  In addition, I can't find how to assign a function to this timer tick when the event happens.  I would also like to set up other compare events in the same RTI module, but if I try to assign an RTI module to one of the cores to allow me to set up the compare events, it throws an error because all of the RTI modules are consumed by the cores.