I would suggest taking advantage of the banks/scan lists and v-scanner folders so you can easily control what you are hearing. If you have stuff in there you don't need on the ready (like areas you don't frequently monitor) you can put them in the v-scanner and have it available to load at any time, without sacrificing your working memory with extra stuff. I have my main file in working memory, but if I am going to head to Denver or Cheyenne instead of my usual three counties I spend my time in, I will load the file with the areas I need into working memory. I just have to remember to take a list with me so I know what’s in each bank.
As far as control channels, it doesn't hurt when you start out to load up on the control channels, note which ones work for which areas, and then get rid of them and condense it down a lot. For Larimer County, I had twelve channels in there at first, and then after commuting for a week and watching what control channels were being used, I condensed them down to three. I actually made separate systems for Loveland and Ft Collins, since the Ft Collins CCs don't work very well down south. This sped up my scanner a lot! Had I not done this (had what seemed like extra control channels), I would not have seen that I needed certain CCs for Fort Collins PD, and others for Loveland. With the pro-96, you can easily lock out control channels that aren't necessary, but still have them just in case. A lot of times the county the site is located in doesn't matter as much as the terrain, so what seems like a more distant site will work well. For example, Bald North and Mount Thorodin don't look on the map like they would carry Longmont, but they do and this increases the range I can continue to monitor Longmont as I travel. I hope this helps! Just remember you can always find ways to improve your scanners! That’s pretty much what I do when I'm not working, at least