Could I run the same category on different platforms, but have separate times? For example, I'm running SM64, but I play on both Emu and N64. Would it be possible to have my name appear twice on the leaderboard with one time as my N64 time, and the other time be my Emu run? Thank you

If the consoles are separated as different categories then yes. If the consoles all go to the same category, then no, because if the LB is set up correctly then your times will obsolete one another even if it’s on a different platform.

For SM64, emu is it’s own category from N64 so in that case, your emu run would remain as would any N64 times you post.