Yeah, no there won't be a glitchless category. Most portal 2 mods aren't very glitch heavy, it just takes the time to remember the routes for each chamber, but overall not difficult. Also, "Glitchless" as a name is incredibly hard to define, which tricks or mechanics count as "glitches" compared to "exploits" or "bugs", whatever. Portal 2 (base game) has a No Major Glitches category, but that has very little activity.
Also current high level runs are more around 1 hour (I think the current non-official WR is a 1h03m time), so two hours definitely won't be the length of the run as long as you're willing to put in the time and effort to learn the routes.
For me the real glitch is CFG, the rest is just small bugs that generally don't have much effect on run. NoCFG and CFG categories - best decision
