RTF is a global modification that replaces all towns in the game.

Is it possible to make it so that allied troops can move through a tunnel dug by a Troglodyte?

In NHF, there was a hero who could create a portal on the map (he was from the Dungeon faction); this is similar to a Troglodyte tunnel.

This feature was implemented using scripts, and I don't work with scripts, so it won't be in the mod... although maybe someone will create a submod with new features.