You should always activate the STAR option when you fly into an airport in mountaneous terrain. You won't be vectored into a mountain and the controllers keep their jobs.
Hmm, what about a list (or algorithm?) to mark certain airports as always requiring a STAR, so PF3 can throw a warning when loading the flight plan and not having the STAR feature enabled?
With Randomizer 3 it will be possible to have a preset for each airport which includes a lot of PF3 settings. These settings can be randomized (thus the name) but also be fixed (by setting the probability to 0 or 100). For example it will be possible to automatically always have the STAR option activated for a specific airport (you can set any probability you like for the STAR option to be activated - so choose 100 % for an airport in mountaineous terrain).
You can already do something with Randomizer 2
viewforum.php?f=10
But if you are not into it yet, don't look closer at Randomizer 2 now. Randomizer 3 will be released very shortly. It offers a lot more options and is much more user-friendly. I think it will be a great enhancement for PF3.