Belongs in the "Idea" forum, but I'd still +1 it. (Putting it in "Ideas" increases the odds that the staff sees your ideas more readily - not trying to be hostile).
Just for future posts, this probably belongs in the Ideas Forum where there already has been discussed a little while back (I can't find that post right now). Otherwise yes it is a great idea :)
ETA: FF and I posted at the same time >.< not trying to step on anyone's toes.
Thanks FF and Gabi - I didn't even think about where I was posting so you've both been really helpful!
xoxjulie - no, nothing to do with teleporting - when you're exploring manually and you set a destination on the map to navigate to, it would be useful if you could set that destination to be directed via a second destination. Hope that clears it up!