I played around with it, don't know if this is still what you're going for though.
I attached the sword to the hero instead of using the mouse behavior (hope you don't mind but I had to draw a tiny bit of an arm on the guy.)
He still does the spinning blade attack but I also gave it a couple special moves using combinations with the right/left mouse that don't let the sword spin.
Left Mouse:
holding Space - Dash-Stab move where you jerk the mouse forward to stab, and then the character bounces back to avoid being hurt himself.
Right Mouse:
holding C - flaming sword (you still swing like normal, it just have plasma attached to it)
holding Space - Hail Storm starts wherever the mouse's X is.
Just about every addition is in a new event sheet called Mouse Movement, its grouped and pretty well commented. Everything else was in the Always or At Startup events.
http://www.box.net/shared/dm4upi3od4
(ps: I changed jump to the W key for my own comfort, forgot to change it back.)