You can certainly ask, I am sure some people here have that WC3 version.
But you should also try the forums of wcnews.com Lots of people there have played it and IIRC even the guys who adapted the games for GOG post there.
Have you tried to calibrate you joystick in the game (ALT+J)? The mouse moving issue sounds like the game would accept commands from your joystick but isn't properly calibrated, which leads to a mouse movement as if you would push the stick forward.
CPU: AMD Phenom II X4 965BE GPU: AMD Radeon HD5870 RAM: 4GB Corsair Dominator DDR3 1600MHz CL8 Board: Gigabyte GA-MA790FXT-UD5P Sound: SoundBlaster X-Fi Titanium Fatal1ty Pro OS: Windows 7 HP x64