I think I have ClosetGnome_Mount working with druid flight form. The problem was that SpecialEvents_Mounted does not fire for flight form, so I had to use SpecialEvents_PlayerBuffGained and SpecialEvents_PlayerBuffLost to test for being in flight form. This is probably not the most elegant solution, but it seems to work. (Well enough for me anyway.) I have attached my modified ClosetGnome_Mount.lua to this post.
Can you upload that lua. somewhere else or reattach it pls? When I try to download it i get a 404 - Not Found error :(