Saying this is a dumb idea, without any arguments saying why it is a dumb idea.
There are already ways to leave your game on without getting kicked.
No actual need for a command like this, but it could make things easier for other people.
.....
Whats the point of it just go to a bank or ammu, there are plenty around.
Explain to me how adding an /afk command would gain lw's players?
If its not in the rules already adding "pausing is only allowed in banks and ammu nation" would be enough
Read the entire topic, all the posts and you will see it is not only about the /afk command.
Maybe a new topic should be made to make it easier.
An /afk command would be as easy as /taichi inside the bank...
So the command itself isnt that necessairy.
It should be explained to people how they can pause, without getting kicked within 5 minutes from the server.
Some pausers who get kicked just don't bother to come back.
And even when they come back they can sometimes create a lower amount of players on the server list.
A lower amount of players probably attracts less other players.
So when this explained properly to (new) players, there would be more people in the server.
And as suggested before by masterbeef, you also could remove the entire time limit.
I don't see a real disadvantage to that.