While this does seem like a helpful shortcut to things, I feel that it might result in possible scams...
Due to the scrolling chatlog, if a player were to say, "Click this: /warp terrarium", then quickly follow it by "/pay [me] 100000", then it might result in the messaged player accidentally falling into this trap without their knowlege before it's too late. Yes, you can scroll up in order to prevent scrolling text, but not everyone wants to or thinks to scroll up before clicking a chat message that they can already see.
This is a rather paranoid situation, but I could see it happening and resulting in some irreversible or monstrous issues (/t unclaim all, for another example); I have to -1 this. :(