Copy and paste has already been addressed:
It could benefit coders if it’s well used.
And about the best 5 multis, that will only make multi scoring useless for all kind of players. Copypasters will have a much much easier task, finding 5 is easier than finding ALL. On the other hand it simplifies a lot for tops challenger players. You just need to excel in 3 challenges, then reuse it on multi and you just need two more multi bots to have the max score (that they can C&P if they want). Having 3 good challenge bots it’s also 3 free multi bots.
Do you think all these 4 players must have the same score in global leaderboard?
CG multi
I don’t think so, sorry. Max Score in leaderboards should reflect the total score of all possible games a new player can do (no matter if it’s “boring” or “take too long”). Don’t fit Max Score to your needs, but to all available options of multiplayer games, for the theorical supercoder (top in all games, no matter what section)
Multi scoring is just a percentage of the global score (maybe 40%). Having just 100% in multi won’t get you to top leaderboard.
It’s just a matter of adjusting percentages of each section (multi, challenges, etc). You tend to promote challenges (fast, time-limited coding), but multis gives the option to test more things, with another pace. CSB multi bots are much much evolved than the challenge ones.