Custom Firewall Settings on CBR-T Router?

Is it possible to truly customize the firewall settings on the CBR-T router?  I know that you have the 3-4 options on the router UI screen, but they really don't offer the flexibility I'm looking for.  I'd like to get down to port-by-port and protocol granularity.

Any way to configure the CBR-T at this level of detail?

Thanks,

-JeffMcG