How do I install this?

The other gravity mods does not changing players gravity exactly how you want it from a command, so i made this one :-) requires: ban
command: /setgrav <name> <number>

Default gravit: 1
Half gravity: 0.5
Extreamly high grav: 100 (not recmomanded)
Very low gravity 0.01
Extreamly low gravity 0.001 (let you jump over the cloads [not recmomanded])
Anti gravity starts from -0.001
and all other combinations...



Do you recommend this mod?