A question and possible request

I’m not sure what the things I’m going to refer to are called, but there’s those visual tools that were added to the scripting engine where you can make parts of a prop disappear, and also something where you can walk through parts of a prop, so I was wondering, has anyone made an addon where you can “cut” parts of a prop off and be able to walk through the cut area? like in the stargate event horizon addon that was… scrapped I think, except without the actual stargate there?

http://www.facepunch.com/showthread.php?t=955089