Is there going to be a new category added for the PC version of this? I want to know because I wanted to start speedrunning the game but I have no idea if it'd be accepted because it was on pc.
Legacy Collection has been added now as a sub category for the existing X Collection categories. Select any% or 100% (XC) for category, XLC for version, and whatever system you're on(PC, Switch, Xbone, or PS4) for platform.
Sorry, I forgot about this for a while. Anyway, we decided to make XLC a separate game from the originals releases for X1-4 on mmrta, just like we did for X Collection, and will be doing the same over here on SRC as well(namely because they can't be compared to the original releases at all due to faster load times and next to no lag, and this just makes the leaderboards neater and better organized). I've put in a request for an XLC board on SRC, but it's still pending approval.
As for challenge mode, we'd need to figure out how to put that on the boards if anyone wants to run it since there are 3 difficulties. I'm thinking just making 1 misc category for Challenge Mode with difficulties as subcategories.
If X Challenge were to get a leaderboard, would there be ILs for each duo of bosses? (With the unique fights from Vol. 2 also being thrown in?)
Probably not unless there's multiple people interested in it. The Mega Man X leaderboards have never tracked ILs even for the main games.