Interesting... an installer could make this process easier, sure. Have you tried this on multiple machines? My experience suggests that Windows machines all vary in subtle ways that make automating the msys installation (and pointing into it with ENIGMA) is quite difficult. If this approach works for other people, it would be good to link this from the wiki.
Another question: are you installing Git along with ENIGMA, or is this just one arbitrarily-selected version of the repository? Those tend to get stale quickly.