This can be very usefull for 10-19 BGs since Rogues is the only class that have an increased speed skill.
"Tricky Treat" - that you got from killing horseman is tradeable so you can send them to alt and use them.
So outrun the hordies (Or alliance) in the BGs when you have flag on 10-19. :P
Note that they will disseappear after 24 hours so this speed can only be used on halloween event time but still. :P
Brooms can also be used, but probably not with flag thought.