For the Quest "Fresh Remounts" in Venomspite you have to get three Warhorses from New Hearthglen to Hansel Bauer.
You can cut this short by one horse if you:
1) Go find a Knight on a horse, kill him, tame the horse
2) While you are mounted right-click-remove the buff that you gain while mounted
(this may cause the lower part of your interface to disappear, don't worry)
3) Return to Hansel Bauer, deliver the horse (if you have the interface bug just press 1 - will do fine)
4) After it is turned in, deliver it again (press 1 blah, now your interface will change back to normal)
So now you have to go out get the third horse but overall you go out only two times. It may not save you so much time but on the otherhand its a third of the quest - and if there are some people around it may take you a while to find a Knight/Horse for yourself.
This happened to a friend by accident and i was able to reproduce it, so it should work.
(tryed the search, didn't find it anywhere, if it is anyway - my fault, flame on)