The basic idea is neat to think about, but there is a way to do this as it is. It does require some work, but you can create a BM for al the caches that one person ownes and then create a PQ off that and view it in google earth or google maps. I created one of my own caches and created a map. I may use it on my profile after shrinking it down a little, but I don't see this as a feature that likely every going to happen in the suggested form. As I said, neat idea...
MYater
I'd like to do that for just caches I've found--and they are scattered across the US.
It'd be a sea of yellow smilies where I live, and then more sparse as the radius increased.
There may be a way to do that and/or what Tahoe_Loren described using macro's in GSAK.