I think that players should be able to buy or craft custom ender chests that acts like the crates in /warp crates. It would be really cool if players could use them on their islands to make lotteries or fun games players can spend money on to win cool stuff!
Have a setting in the island settings to allow/disallow Stair chairs. Reason: Can be used to block glitch out of areas. Video: https://youtu.be/uL3lzJ0WCIM
As seen in video you can use stair chairs to glitch out of areas and I shown that I can do it on others islands as well.