Hi Jerry,
The only limitations for multisite is a max of 32 freqs, but you only need the controls and maybe the alt controls programmed.
You can program the controls and alts for Thornburg and any other tower within reasonable range that gives a strong enough decode rate. If you program other towers, you may need to set Multisite ROAM or STAT. I use ROAM.
STARS will have flaws with out the latest 1.2 DSP and CPU upgrades so insure you have them installed.