sure I'll show the exploit, I don't use it i mostly pvp and just thought it was kinda cool. I reported it and what not. I do agree that sprint could use some help, I am coming from a strictly pvp perspective but the Mobility that punishing charge gives with sprint is nothing to laugh at.
I also have a glitch of my own, You can instantly reset the cooldown of Roar if you sprint at the end of the animation. The first part of the video is a guide, but the at the end it shows the bug. http://www.youtube.com/watch?v=A1D_zhKxl0s