[thetwistedpanda]

You'd have to do it manually for each map, there's no way around that as maps are not uniform - you should be able to create it via a script, as I recall there being a snippit to create brush entities. It may take a good bit of your time, but it's a fool proof method. Can even load the maps into hammer, make the entity the right size, grab coordinates, then load it into a script that re-creates them without having to download a new map.

That's just the easiest method that comes to mind. Alternatively you can set a single area per map and just loop distances to see if they're within x units, but that's far more intensive. All maps are different so you can't rely on using teleporters, grabbing weapons, hooking bhop platforms, etc. Although you could write an overly complex system that uses pre-defined configurations as to what methods you want to hook. A plugin that manages picking up weapons, bhop platforms, killing the T, etc and simply tell the plugin what methods to use for what map.