First you need AWWE's xyz-hack
So...
Log into your Char, mount up to your Epicmount...
Use the hack to go up and then down again...
Press Spacebar (your mount makes a noise)
Now dismount and you will get disconnected...
Login again...
And you run with 100%
(I've test this with my mage on his undead horse and with the alterac wulf... pally mount won't work.... =( )