Sliding will make you go faster for a little bit, until your momentum runs out. You can also slide in every horizontal direction. Sadly if you slide down a ramp you don't get more momentum, and the slide runs out the same as if you were sliding on a flat surface.

Bunny Hopping is a fairly simple, but useful tech. To do it all you need to do is slide and then jump. This is the fastest way to move I've found so far, you can combine gun shots (e.g. shotgun) to get more movement in air. You can Bunny Hop in every direction you can slide.

Wall Running is quite unique in sprawl. You carry your momentum into the wall run. So for example you can Bunny Hop into a wall to get quite a lot of height and have a lot of speed going into the wall run. You also only get 2 jumps off walls while wall running until you touch ground again. Also you can jump into walls to get height. When wall running if you look away from the wall without strafing you will fall off, but if you strafe during a wall run then you can get a lot more distance during it, and stick to the wall really easily.