This allows you to jump off your mount and never worry about it being stolen mid combat. This one is simple yet hard to time correctly.
When dismounting look down press f and space bar.
If you time this correctly your mount will shoot thirty feet in the air and will be immune to theft.
NOTE: To remount you need only look a few feet off the ground and press f.
For people who do not play darkfall, mounts costs a lot and get stolen all the time if you are not careful about them. Despawning takes about 10 sec, and this is often too much time to be able to dismount at a safe distance / despawn the mount and then catch up to the person on foot.