A version is minecraft that is forever stuck at 1.7.3 is not very appealing. If you want a game like Minecraft that's open source, check out Minetest http://www.minetest.net/
(it was frickin sweeeeeeeeeeeeeet)
Next project is to set up some arkham style gliding challenges, although in this case missing the target by even a small amount is like to result in death...
Pilot wings in Minecraft?
Sounds awesome. I enjoyed some of the dropper maps, and that game where you jump off a high point into a pool and place a block each time, making the target smaller and smaller each time.
Also, some of the major redstone additions from the later versions, which are the ones I'd miss most.