So far just adds a few simple "." commands:

.qpt imat  Tells the everyone in the selected chat window your current coordinates, eg: I'm at 500 118 -1000
.qpt this   Tells the opened chat window what you have in your hand, eg: Iron Pantograph
.qpt c        Copies your current location to the clipboard so you can paste it somewhere else (v 1.0.1)
Will add more as I think of things, feedback welcomed!
(Note a lot of stuff may not be possible because it's a client side only mod)