Are you sure you didn't accidentally overdo the movement speed? It just feels way, WAY faster than it should; it just feels like a glitch or something.(I'm playing No Rest For The Living and HOLY HELL it feels like you move real fast...
I play every Cosmobyte mod with always run disabled. I think that most of the movement systems of his mods are balanced for holding shift to run and releasing shift to move at a normal pace. If you play Nightmare Logic II, III and IV for example, their sprinting systems doesn't work properly with always run enabled.