This looks like a very good idea. I would actually modify this so that it allows me to make other kinds of zones, because I have my own kind of triggers I made that I would want to place around, and this would make life a LOT easier, and the accuracy would be much easier to make the correct size.
I'll give it a try next time I'm in game. Also, if this is a finished mod, why is it in modification discussion?
It's not. I'm doing the same thing that you're thinking of doing, including a GUI. I decided to release a 'dumbed down' version of it (being safe zones only, with no GUI), just due to people asking for it. Once I finish the big fish, though, it'll be the followup to this, complete with arenas, shops, money-making, named areas, stacking areas, you name it, it's got it. Or, so goes the plan. That is why this is in discussion, and not released as a full mod.
The idea just came up with the hassle of having to do F10 and manually lay down everything. I usually run on a dedicated server, so that was clearly not an option. So it hit me, why not use something similar to the 'measure' tool? That's exactly what I did, and my lovable three-position method for making an area was born. But yeah. I released it for the benefit of the community, so enjoy. When I get more stuff together, expect more releases! <3