Where "tokens[1]" is, is where your parameter will go, if you tokenize the player chat before having to remove the player.
I.E.
PHP Code:
function onPlayerChats()
{
if (player.chat.starts( "/remove" ))
{
tokens = player.chat.tokenize();
clientr.levelbans.remove(tokens[1]); //Assume this is the account of player
}
}