[crunchcaptain]

Suggestion: add a field to use a custom DNS server.

Then one could get different screenshots for the same URL (i.e. to use when testing or migrating websites).

[teleclimber]

This might be where there is value in the idea.

You could also add different User Agent Strings, different Request IPs etc... to simulate different users in different parts of the world.

Otherwise it seems some open source script could do this very easily and free.

[lewsid]

I've built a tool that does more or less exactly this - give it a try, maybe even send some feedback - http://www.geopeeker.com

Updates are in progress that will let you do all sorts of tweaks to the agent, even the DOM.