This could be used for speed running.

The first video involved me showing you that you run out of sprint way to fast, but the slide apperntly goes on forever.

Just sprint to get the speed for a slide,then slide jump land slide over and over and over. You'll get the hand of it. Sadly you can't turn like this which is a down side.

this looks very cool, thanks for sharing

Alright, with a bit of practice you can also land it perfectly to gain a bit of a speed boost similar to bunny hopping in Source games, but to get speed over stamina you have to be on a long straight.