Can a mouse/keyboard be used to speed up the process or is the Dualshock 3 the only way?

You can use a keyboard to input text, but that's it (that's a much bigger time saver then you would think)

I am amazed every moment at the depth and richness of the editor. There are mechs out there in LBP world that are piston/gear operated that have 100s of moving parts. Hopefully mouse support will come along soon as that would make it a LOT easier... The best stuff, in my opinion is coming out of Japan...

Best creation I've seen is still the working engine that worked with explosions and pistons. Was too awesome for words. Perfecting the concept is on my LBP to do list at some point.

Have you got a name for the creator of that concept and do you know if it is still online?

I'm afraid I didn't heart the level because all that was in it was the machine. And it was in the beta so I'm not even sure I have the thing still. Perhaps I'll recreate it for you some time.