Here is some script code that you can use to reproduce this feature how you want it to. Please note that all of your MP!L contacts will now see "/me" when you send one of these messages though.
code:
function OnEvent_ChatWndSendMessage(ChatWnd, Message){
return Message.replace(/^\/(\/me\s)/i,"$1");
}
function OnEvent_ChatWndReceiveMessage(ChatWnd, Origin, Message, MsgKind){
return Message.replace(/^\/me(\s)/i,"ĢI$1");
}
Also note, I did not test this, but it should be fine.