It would be very nice to be able to modify the server's allowed max health during runtime.

Currently users are forced to modify this value manually, so plugins that rely on values above 1024/2048 health are forced to either document a setup step where users change the value manually and then restart or modify the value themselves and then requesting users to restart.

Currently I am setting this value myself via

Bukkit.getServer().spigot().getConfig().set("settings.attribute.maxHealth.max", 100000000);

and then saving the file, which queues a modification for the next restart.

However, even though I've documented a request to my users to restart the server once before setting up content that uses values above 2048hp, it has become a consistent point of failure for them, especially for non-English speakers and some of the younger admins.

It's a minor thing, but it would be a cool thing to have.