I programmed a separate site for each zone. Then enter the freqs for that zone only. Disable CC only.
If you live closer to zone 1 for example (which is Morristown, Randolph, Netcong, Chester, and Dover) then lock out the other three zones. This will help prevent you from locking on a distant control channel and receiving transmissions broken up. Also I've seen the scanner lock on a weak cc channel but not have enough signal from the voice channel to unmute.
Now understand how SmartZone works - Let's say two units are the only radios on that talkgroup and both are affiliated with Zone 1. Those conversations will only be heard on Zone 1. The system is smart enough (hence the name) to not assign resources in the other three zones if no radios on that talkgroup are affiliated with the other sites.
For the most part, try to aviod listening to the site 3 or 4 as those are smaller coverage areas and possibly will not carry all transmissions.
MIRS1 calls should be heard on all sites since there are control stations in each police department across the county.