What should be added or changed?

I would like /back to have a configurable warm up period, so that when a player dies they must wait a set amount of time before /back will take them to their death point.

Why should this be done?

This will allow for an alternative way to get back to the grave, while not being able to zerg deaths. I would prefer this over the cooldown because I also intend to have the Corails Tombstone mechanics available for people who either invest into enchanting their key or stocking up on pearls.

Example: Player dies, they get their grave key. They can choose to enchant the key immediately or wait for /back to become available. This is intended to be a contingency for players who forget to do /sethome when they go off exploring and die unintentionally.

Added for 1.14.4 in v1.2.10