Boat/ship solution

Remove spacebar flying functionality, make 'shift' dismount anywhere (instead of checking for a solid block). The floating animation can be handled by blockbench.

Currently I can spawn/teleport a ship at my chosen Y-level and have no issues 'sailing around'. I just cant dismount because it acts as a submarine and goes down, and spacebar obviously flies.

This alternative would satisfy a lot of people on flat water and doesn't require much modification on your end!

It would also potentially require checking blocksInRadius and setting velocity to 0 if someone is trying to go on land, but that can be handled by Mythicmobs as well if need be!