The Sliding system inside my Maze Designer has three different sliding speeds on three different ice terrains.
3ICE's Sliding System for RoC only has one terrain type and one speed, although they can be dynamically changed this is not as effective as having a three in one trigger. Also the system inside MD has extra features like jumping, teleporting, etc.
I learned JASS in an hour, by reading the JASS API docs.
p.s.: the sliding system I wrote for Maze Designer also has: Boosters (temp speedup effect), Jumpers (throws you in the air), Teleports (instantly moves you somewhere else), etc.
I'm fairly sure you know about google, the search engine. http://www.google.com/search?q=JASS API docs. I made sure in my post above, to include the perfect keyword for making it easy for everyone to find the JASS API docs. It is the first result.