-ryuk- also contacted me and we came to the same conclusion for that error.
Great support from -ryuk-, can recommend everyone to do business with him.
Got it to work, here's what I got to work / didn't:
Teleport hack - Works nicely, but limited to continents. CTRL+click on world map to teleport there, very easy to use! You disconnect and spawn high up in the sky where you clicked. Edit: Experienced that it would disconnect me a second time @destination and returned me to starting spot. Dismounting fixed this for me. So in fewer words: Dismount before use. Edit: I tried mounting up my flying mount when I was standing in thin air, but rather than letting me fly when I moved I began falling down. So flying mounts will not work to get down. Can't be used from within an instance to another place in the same continent.
Fly hack (.fly) - Also works nicely, very much like DarkLinux's Stratos x64 if anyone's tried it (but without object clipping). Normal WASD movement with camera to change up/down.
Hover hack (.hover) - I've got this to work once, but when I was going to turn it off again it crashed my wow. When it works, you cannot jump.
Water walking (.water) - Works great. Note that you can't go below water while it's active (like you can with waterwalking buffs).
Stop falling (.sf / .stopfall) - If you find yourself out of luck falling to your death this if for you! It stops you midair, works great. Just move to "jump" down. Edit: tried it a second time, this time it crashed my wow same as with the hover hack. Tried a third time, and falldamage killed me.
Unlimited jumping (.jump) - Works. Spamming space will make you continuously jump upwards. could also be used for avoiding fall damage perhaps?
Follow anyone (/follow) - Works just like following players, and very nice for escort quests.
After using it a little it looks like it just sometimes crashes wow, regardless of what function is being used.