!block

!block is a command for Special:Chat that allows any user who can block users to block users entering a simple syntax on the message input.

Usage
To use !block, the following data must be entered into the textbox: !block USER | REASON | EXPIRY

To set options for the block, there are 3 additional options you can add to the command: !block USER | REASON | EXPIRY | disable talk page | disable autoblock | disable reblock

The last 3 options do not have to be in the order you seen, but they must go after the expiry in order to work.