Well, I feel like the chats are going into a totally different argument :D
But my idea about the thing is that, why do you play Skyblock at all if you want to fly? Isn't falling down the whole point of playing the Skyblock? I know you want to build freely ingame; Well, you can do it in singleplayer creative maps or CMP servers.
If you choose to play a SMP server, you need to gather all the resources for your build, and if you choose to play a Skyblock server, you have to bear the cost of falling down. That's just how the thing works I believe :(