To be quite honest, i completely understand why MCSG has upheld it's blanket ban on BSM. I mean, I'll be the first (second, third, fourth?) to admit that i use it. (Not on these servers, i havn't played mcsg since May, i think). It's a handy tool, and isn't heavy modding, it just makes game play that tad easier.
As previously said by myself, there is a misconception that you can sprint backwards and sideways whenever and wherever you want. THIS IS NOT THE CASE. If it was, i think around half of the people using BSM, wouldn't. You can only do this on single player and to be quite honest, i think this show's the maturity of the mods creator. He hasn't created BSM to help people cheat. He was built it to overcome a much hated Minecraft glitch.
However. The one issue and difference between 1.7 sprinting and BSM is this. BSM is unlimited sprint (restricted by your hunger bar, of course), whereas 1.7 is not. With BSM you can sprint, hit a block and slow down, then move away from the block and start sprinting instantaneously without lifting a finger. With 1.7, as far as i know, you need to re-press the sprint key to start going again. THIS IS THE ISSUE, and i completely agree. There is still a difference, albeit the difference has been reduced somewhat, and this means that fair game play is still not possible between vanilla clients and bsm modded clients.
TL : DR - Take 2 minutes of your time and read what I had to say.
^ I love you for this, Kids should learn to be patient nowadays.