The boss leaderboards were added here

We might also add the training trials if there's interest, might be cool

Would be cool to have individual level leaderboards for each boss

You can probably use console timing if you're unable to use the load remover anyway

Start when creating a file, stop when screen turns dark

As underlein said already, the objective is to get the maximum completion possible on different patches. If you allow newer patches for less completion %s you can get that % in different ways.