OK, I'm not sure if there would be much of a use for this or if it is just common sense but when u use a skill such as sprint then logout straight away. Then u log in 5 minutes later and u are still sprinting also your sprint is off cool down so like a double sprint. I've also tried this with evasion. (only tested on a 70 rogue)
Well note that this isn't quite that good of an exploit but I would imagine it could be exploited in some way to become one. Don't ask for a screen shot either because its pretty self explanatory.