I don't think it would kill anyone to allow Explorers a wider variety of terrain-specific skills/spells to work outside their home terrain.
Specifically, I'd love to have Bloodletting and Swarm of Leeches work outside of an actual swamp (in the wild) if the check for Wanderlust passes. Right now it's a hard-coded check against swamp-or-not, which means the skills don't see and won't see any use pretty much ever. I mean, I willingly give up Bearcharge in exchange for a very questionable combo, can I at least have something minor in return? Thanks.
I think this would apply to all explorer rangers, They explore, so when they pass the Wanderlust check, they should have access to all their wild skills imho. Not mountain-bearcharge home-terrain wise, of course, but similar to Bloodletting, what's the harm in that?