You're missing the point. The x36 favorite lists can be much larger than with other scanners. You can add stuff to a favorite list farther out that you have any probability of driving on short notice, and then use GPS and Location Control to keep the scanner from being overwhelmed. There's no reason you can't have everything in a 100-mile radius in a favorite list customized to match your listening preferences.
That's basically what I've done, except I split my data into 5 lists, each corresponding with a state--Pennsylvania, Maryland, West Virginia, Virgina, and Washington DC. Each list contains all statewide systems for the state, plus all counties within the state I have any possibility of visiting. Each list has location Control enabled. When I travel, I toggle on the state lists I will be traveling through, and let Location Control and the manual tweaks I've done to the list do the rest.
Setting up these lists is easy. The first step (and the hardest) is to make a list of all of the states and counties within 100 miles (or whatever your normal travel radius might be) of your home. Sort the list by state name, then county name. In Sentinel, create a Favorite List and give it the name of the first state on your list. Make sure you turn Location Control on.
Navigate to that state in the Main Database in Sentinel, and go to the first county on your list for that state. Click the + next to the county name and you will see Nationwide, Statewide, and County Systems under the county name. Click on Statewide first. You will see a list of statewide systems on the right. Click any one of them, and press CTRL-A to highlight all of them. Then hit INS to add those systems to a favorite list. A dialog will appear allowing you to select which favorite list the items will be added to. Repeat this for the Countywide Systems under the county.
For subsequent counties within the state in your travel area, repeat the process, but you do not need to keep re-adding the Statewide systems to the state favorite list. You only need to add the Countywide Systems for each county in your travel area. For a new state, you'll need to create another Favorite List with the new state name. then add the Statewide sytems, and all County Systems for each county in your travel area.
It sounds complicated, but once you've done this a few times, you can do this in a few minutes. It takes me about 5 minutes to refresh 5 state Favorite Lists with about a dozen counties.