Not really, since it's developed by them and for them (a mac house). He seems pretty welcoming of your additions to make this Linux/Windows if you desire... but why on earth one would expect that THEY would have taken the time to make this multi-platform when they don't use it that way is honestly beyond me (i.e. silly).
Yes but VIM runs on everything, why make it Mac OS X specific when it's simplistic to make it "just use these vim files and it'll work on every computer"