An interesting feature to add would be a 1-10 scale of how difficult it would be to start running a game. This could help people who want to get into speedrunning decide which game they want to run first.
I think that instead of a 1-10 scale, which is highly subjective, you want to work with keywords (frame-perfect inputs, clawgrip, fast analog movement, blind walking, mashing, memorization etc.) would be better.
But even then, a keyword or a number shouldn't be the deciding factor if and what game you should run. I was scared of a certain speedgame back in the day, but years later, when I finally started running it, I found it to be not as bad as I imagined, even if the game has been grown in difficulty in my absense. Next to this, you shouldn't expect that a runner has to abide by the top-strats. If you want to run a game differently (avoid dififcult strats until you feel more experienced, negate a certain thing because it's not fun, or any other argument), then those keywords would also mean nothing but gatekeeping.
