Given the number of possibilities this game has, it's swamped by the number of sub-categories it can have:

1. Faction (for now there's only Renegades, but there's plans for up to 6 factions total)
2. Single-Player or Co-Op (each faction presumably has both)
3. New Game or New Game+ (If you start with a blank file or with all the unlocks)
4. Bronze, Silver, or Gold (Depends on the number of stars you get on each mission; one, two, or all three)
5. Beginner, Normal, and Hard (Can be a non-subcategory variable. I know 100% can't be done on Beginner)

Going HAM on all them would total to 216 possibilities NotLikeThis . It can be thought about more when there's more runs/runners.

For the moment, I'm fine with not including Silver stars, mainly cause Gold star is almost always just the silver star with a time constraint

should we use IGT or RTA for ILs? IGT is accurate and rounds to the nearest second, so I'm okay with it

Yeah, in-game time is really accurate. The most a full-game run would be off by is ±12.5 seconds. It also removes load times, which is nice.

They've added the Guardians faction since. They can be added as a category once someone has a run, so it doesn't look to cluttered.