Darius Noxian Might - Cooldown Suggestion

Darius, upon getting 5 stacks of his passive (or killing a tagret with his ult) gets a huge AD steroid for 5 seconds from his passive.

I don't have a problem with that, it's what allows his to build Juggernaughty tanky items. What I don't like is that there is no window to counterplay that mechanic once he is in a teamfight.

What I would like to see is something like a 10 second second cooldown on the ability.

This would mean once Noxian Might goes active he has 5 seconds to instantly apply 5 stacks with his attacks and abilities. Afterwards he would go back to normal mechanic applying 1 stack per attack or ability for 5 seconds. The cooldown is twice the length of the buff because the stacks themselves last 5 seconds anyway.

It would force Darius to manage the stacks better during teamfights and would give the enemy team a window to run away (like from the killer rabbit), kite him for 5 seconds and then turn on him again for 5.