In the @rust-lang/lang meeting today were discussed that it feels odd for our p-FCPs to reach FCP with just 3/5 checkboxes.

I would propose that the rule change to "⅔ supermajority and at most N remaining" -- for a team of 4 this would still require 3/4, but for a team of 5 it would require 4/5 instead of the current 3/5. 4/6 would be unchanged for a 6-member team.