http://forums.bukkit.org/threads/fun-fix-cartjump-v2-0-allows-minecarts-to-jump-1-2-3-r0-2.32959/ Cartjump is a simple plugin that does 1 thing - it allows server owners to configure cart descend physics from a scale of 0 to 5. Zero represents no descend and minecarts just float forward and 5 represents normal falling descend. Compared to the other minecart plugins out there, this will just be a super lightweight plugin with 1 feature.