I think it would be a good idea that on new game load/start, when you click rail/road etc, it doesnt automatically do a scan for routes.

Eg:
I load up my game (large map with very high cities and industries), and open mod, if i forget to change option at top to "within circle" before clicking on one of the options, it does a whole map scan for transit/cargo, and i need to wait for that to finish before i can continue.



Recommended change:

Do not do an initial scan after loading mod and clicking route type for the first time, open the blank page (like when no routes are found in the area), and then either add a new button for "Initial scan" (one for transit, and one for cargo, as usually i only want to search for 1 or the other at a time).
Or other option would to not add a new button, and just continue to use the refresh button there to perform the initial search