I’m not very familiar with Radio Shack models, but I’m going to give it a shot. As per how many frequencies you need I am not sure. With my BCD396T I just use the control channel only option. I am not sure if the Pro-2096 has this option. I believe you have the option to scan in closed or open mode for the Pro-2096. Closed mode, I believe, will only stop on talkgroups that you have programmed, and open mode stops on any talkgroup whether you have it programmed or not.
Here is what I know as per who uses SAFET: ISP Putnamville (this is Morgan County’s ISP district), INDOT, Mooresville PD, Mooresville FD, and Morgan County Sheriff are using it pretty much full time. (I can still hear Morgan County Dispatch side on VHF sometimes). I have heard Martinsville PD on SAFET on some occasions, but I don’t think they are on full time yet. So to just get the local SAFET agency’s you want, program those talkgroups into your scanner and chose the closed mode option. I hope this helped you out some.