Disable and limit the use of back

[therealeldaria]

I would like to limit or even disable the usage og back.
For example only allowing it after death, to get back to where one died.
Or disable it entirely.

As it is now it is pretty OP, A user can use back and then back and then back.

I would also like to configure some type of cost of using the command, like XP, Food, or server Currency, this should actually be on every type of teleport. I will create a separate issue fot this.