it’d be more convenient to have navigator navigate between stations with different names and have navigator show time that player has to walk to a different station (sets manually) and some text to tell a player how to walk (on ground or underground) Example:

A->C:
A->B1
B1-B2 (above ground transfer takes 2 min)
B2->C
Journey completed!

sorry if that’s already somehow implemented, I haven’t found it tho

Maybe a good idea would be to add a option to global settings similar to station groups, where one would create a transfer group between stations (if a given station is in a tag, then you could either reference the station as a whole, or a given platform) and for stations in a given transport group, it would allow walking transfers with a given walking time.
If you wanted to have multiple walking distances, you would define them separately in a different group.
Example:
we have stations A, B, C and D
A, B and C are in a close proximity, all having walking distance of 1h 30m between each other, so you would make a transfer group between all of them, set to 1h 30m.
Station D is 1h walking distance from A, so you would create another transfer group with 1h walking distance of 1h between A and D
B is 2h, so you would make a transfer group 2h with B and D
this would allow walking transfers between all stations except C and D, with multiple different walking times

A - B = 1h30m
A - C = 1h30m
B - C = 1h30m
A - D = 1h
B - D = 2h
C - D = not allowed

maybe it would be fine to also allow filtering by walking distance in the search app and/or allow users to override walking time, so it would show you transfers between platforms you couldn't theoretically make, because of walking speed, but a user disabled this, because he has a jetpack or something allowing him to go faster, so he would be able to judge the time himself

Also allowing to set specific platforms in the transfer group would allow users to set specific walking distance between given platforms of either the same station or between multiple stations.