What I mean, is for tombstone to work in all regions (even those you aren't a part of). I say this because lately there's been an influx of people pushing people off ledges at spawn, pushing them into water, etc. to kill them and take their stuff. I don't really think it would matter that much to have a chest somewhere (since most people claim them ASAP). Would this be possible?
I don't think this would be possible. The region is preventing you from "placing" a chest in an area you don't have permission to. Also, if it happened, the tombstones would spawn in spawn, and people shouldn't be able to "place" things in spawn. People would also not drop stuff in the PvP arena.
The main reason I brought this up was actually for spawn, since the newest noob-builder thing to do is push people off ledges and steal their stuff... Perhaps we could make it not work in PvP, or if the "not placing things down" is the main issue, perhaps we could just make it not drop your inventory?