I think it's necessary to block the Milan–Trento route to make it both more historical and to make the front lines even narrower than the Western Front.

The mountains favored the Austrian defenders, but Italy was able to threaten both the Trieste and Trento routes simultaneously from one central position, which was their advantage. Austria won't have a factory in Trieste (but the Germans will have one in Munich). The front line will still encourage the Austrians to take Udine for a better defensive position, which was historical.

Should the Turin–Lyon route be impassable as well? Maybe @cernel could help us with this?

@Schulz I think it would be neat to use the mountain territory effect in Trento/Milan instead of making it totally impassable. You could restrict units like tanks from entering, give defenders a bonus, even have a mountaineer unit which performs better on those tiles.

There’s also movement cost for territory effects which could slow down cavalry.

I think the Trento-Milan route should be impassable. The Tunis-Ghadames route doesn't make much sense, but it is necessary to give the Ottoman-controlled Senussis another target besides Italian Libya.

@djggml
Short answer no,.
Please post these files
map.yml
pact_of_steel_233.xml
here.