Is there a way to link to a specific leaderboard? Right now all the leaderboards share the same link so it always sends it to the default normal softcore players one page. Do the mods have control over this or is it a problem with the website in general?

You can only link to the top level categories (as far as I know):
Any% Normal - https://www.speedrun.com/d2lod/full_game#Any_Normal
Any% Hell - https://www.speedrun.com/d2lod/full_game#Any_Hell
Pacifist - https://www.speedrun.com/d2lod/full_game#Pacifist

And no, we don't have control over this.