Though certainly not a "must have" caching need, it would be mighty handy to be able to import waypoints into an offline list. For example: I have a GPX file of cemeteries in my state, and many times I'd like to see which ones are near the caches I'll be visiting. Similarly, I also have a GPX file of waterfalls and like to see if any of them are in the vicinity.
Maybe feature to consider "one day."
James