I'm not sure which scanner you are programming. I'll only speak for the PRO-197.
On the PRO-197, in your TSYS object I think you can put somewhere around 20-24 control channels. With two control channels per site, that gives you 10-12 sites you can covver in one TSYS.
1. In the TSYS object, you should run Multisite STAT
2. Historically, the MARCS alternate control channels have never been seen in use here in East Ohio. So theoretically, you could just put in the control channels that are "red" in the RRDB. Those are the primary control channels.
If you are using the pRO-197 to monitor from a stationary position (your home for instance), you really only want to have the control channels in the TSYS object that you can reliably hear. Don't put weak site control channels in because you probably won't be able to decode the the scanner stops on that weak site control channel and determines there is traffic.
Only add the control channels for sites you really want to hear from..
I live in Jefferson Co. When I'm on the external antenna, I get good signal strength and reliable copy on at least 7 MARCS sites. If I were to add all of those sites into a single TSYS, and if there is no traffic on any of the sites, and if I'm using Multisite STAT, it takes at minimum 7 seconds to scan through that object all by itelf -- about 1 second per active control channel. You can miss a lot of activity in 7 seconds. So only add the sites that you really want to hear from. That way you will spend less time scanning through all of the contro channels.
That's just my recommendation. Others probably feel differently and probably do it differently.
Mike