Hello everyone! I found a neat little glitch today whilst messing around with this hack. It will only work as a death knight, but it could be considered a potential "speed-hack". I don't know if this has been found already, but, I'll say it anyway! As a death knight, I ported to Acherus by using Death Gate, and then teleported to Stormwind using WoWPlus. Doing this allowed me to keep the movement speed buff that I receive while being in Acherus, however, it did not display the buff on my buff frames. I simply had increased movement speed.
I'm not sure if this will persist through loading screens, so I'm not sure if it has potential use for battlegrounds, or even raids. If someone wants to mess around with it and report their findings here, that would be great!
EDIT: Also just discovered that mounting while under this effect seems to disconnect you, however it will not cause a crash.