We want custom mobs we can create. With this we can make giants naturally spawn on top of bats. Creating Flying GIANTS! Just a request and idea. Hope You can do it!
timtower , I believe in imagination, I believe in sparking an idea and letting that person make it his own, not commanding them to do my bidding.
I'm planning to add passengers/riders to the next version of MegaCreeps, but it's not in as of now. You can do a whole lot with it already, though: http://dev.bukkit.org/server-mods/megacreeps/