Wouldn't that be fun eh? The closest thing that CSGO has in skating is the surfing custom maps. Instead of surfing water waves, you slide through long curved slope tiles with your feet thanks to the weird movement physics, I think it's more akin to skating in that regard. I'm not into skating myself (or CSGO for that matter), I figured you'd like to know about that if you haven't already, but even then I'm not sure if that was just for Alex Stryker's character in Werewolf Tale.
Not really a CS-GO player either; online shooters aren't my thing when IDTech1 and the Build Engine games have mods and overhauls galore. That is a neat mod, though. Thanks for bringing it to my attention.
(The surfing maps sound reminiscent of Slide Quake. Skateboarding in the IDTech2 Engine. That mod was fun, and it still works to this day I believe. https://www.youtube.com/watch?v=kH-B9UY9P8I)