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This should be in the suggestions category for one, and also wishlists (ie suggestions that contain more than one subject) are disallowed.
However i’ll still address the points for the sake of it.
Ranking systems are confirmed to not be coming to the hive.
Pretty sure this was also denied (someone correct me if i’m wrong)
again hive is a minigames server, i can’t see something like this being added, as well as they don’t copy things from others. it’s not a very original idea
Are you referring to in the hub? Specific games already have unlockable trails.
I doubt they’d add hub cosmetics like that, at least at the present, because of the amount of particle lag this could cause.