The punish brush already contains some of the things that would be encompassed in this request (blindness, jump boost, etc.), but would it be possible to have a brush that contains all potion effects? (They could be added to the punish brush, but they are not exactly punishments). For example,

"/b potion haste [-toggleSM playerX]" - select haste
"/vc 5" - choose haste potion level/strength
"/vh 120" - choose duration

"/b pot [slowness | weakness | regeneration | invisibility | etc.]"

"/vc #" and "/vh #" would not apply to all potion effects, obviously.