I don't want to present a whole application environment to the user, I want to disable everything not having to do with the task at hand.
Also, it gives people with more limited bandwidth connections the options of downloading the entire thing, or a highly stripped version that is much smaller. It certainly makes getting a "build environment" easy when asking for contributions though!
Dolphin has a similar tool and is now open source, perhaps there is something there worth investigating for Pharo.
I'll check out Phratch (also, Scat is an unfortunately named tool).