is it possible to have a gui for mushlient?

It's possible to build your own GUI and have MUSHclient communicate with it via COM or UDP, but MUSHclient does not have its own native GUI components such as gauges, buttons, etc. Search the forums for wxPython and you'll find a tutorial on how to make a compass with buttons.

There's a plus! You can make a much more fancy GUI for MUSHClient, it's just harder.

I could make the same amazingly fancy GUI for zMUD, using COM. It's just not as necessary since the most popular GUI elements are already built in, saving me valuable script-writing, game-playing time.