Hi, great game.
2 simple suggestions…
If you have got to a place, you can set a start or end to a tunnel, load it up with relevent resources (possibly even thrall to do work) including wood, food for thrall, etc, and after a build time would award you with fast travel between point and gathered resources from the dig out of the tunnel, mainly stone, small amounts of iron, silver, gold, brimstone, etc.
New workbench… Cartographer. A way of clan members to share information on maps. The cart bench could be downloaded to and uploaded from to form a ‘clan map’ for people to share exploration points that they have come across. This could even include the introduction of a new thrall who could add extra map locations depending on where he is captured from.