I would also like to see something like increased swim speed and holding breath longer, maybe even group buff versions of those. Those are not crazy impactful, but I think its a good theme for a class thats supposed to be outdoor focused and helping with overland transversal.
I like the idea of allowing for rangers to be able to skip around a zone. Maybe there is a ranger burrow your group goes in and then comes out halfway across the map. Its not skipping entire zones like mages/druids, but if a group is traveling overland, having a ranger could really cut down the time.
Along with the campfire buff stuff (which I hope there are a lot of options), maybe things like ranger campfires/torches illuminate more area/have a larger effect radius the other campfires. I could also see something where a ranger could possibly provide shelter so campfire buffs work in the rain.
I also think it would be neat if perhaps dual wielding could take into account if you have a torch. Maybe if you have one equipped, you can do things like add burns or some other stuff. Perhaps the system that allows you to buff campfires, allows you to also modify torches so you can proc different abilities?