kz/course sounds awful because when you go play kz usually you jumpstat or beat the map FASt, but course is more like a social activity. When you play course usually you chill with other regs, but kz (much like bhop) is very solitary and you just focus on beating the map fast. It would also suck if you are trying to lj or whatever and a bunch of annoying ass people micspam "course crusaders" and they change the map to course. Adding course to bhop would be stupid as well because people wanna work on the ssj, sync and map knowledge.
The swoobles course server is very active, so it would be a good idea to make a course server