Suggestion to add runs for a single track, where the goal is to complete the one track as soon as possible.

yes they should add that

it should be added under levels as "Sw-1,SW-2,RR-1,RR-2,RR-3,SZ-1,SZ-2,SZ-3,A-1,A-2,A-3S-1,S-2,S-3" or so

I agree!