I'm an artist and a new one here too.I'm not a programer so I just want to now if I have your support.
Can weapons be possible in wme(I think with the wme api would be posible) and is threre an example.
Everybody is welcome, so... uhm... welcome.
Even if I couldn't immediately help you in the chat channel, but well, I'm not actively developing a WME game.
So for your question - yes, it is possible in certain ways, like adonf already mentioned, you can attach meshes (weapons) to actors and the API allows you a lot. But, you have to keep in mind that it's no full 3d engine, so stuff like collision detection etc. is not easily given yet.
You might also want to check this thread and the containing sources:
http://forum.dead-code.org/index.php?topic=1333.0Feel free to ask detailed questions, good luck.