I'm also curious about an extended travel system. But, maybe, I'm poking around the edges of an extended action system that could be used to simulate things like climbing, travel, sailing, or tracking. In RM I would assign a difficulty and use a cumulative % total. Each roll would be a % accumulated over a specific time frame. I recall Novus having a similar resolution system somewhere. Libram #?
Anyway. The Lord of the Rings game published for D&D 5E has a splendid travel system accounting for travel through dangerous areas. That might be a fun supplement to develop for Novus.