If you skim through this thread, you'll see reasons why SMW ILs are not feasible or desirable on the leaderboard: https://www.speedrun.com/smw/thread/t46ap

To sum it up, there's a lot more variables you can have for each stage, like small only, no cape, etc. but that's not the main problem, the main problem is having the IL leaderboards be competitive, which for SMW in particular is a really hard sell.