That's what World of Warcraft does, it has a Global Cooldown system to help account for unstable connections.
It's only 1 second or so, and lots of actions are off the GCD, but all you would need to do is extend that time and put more things on the GCD and you'd effectively get what you're looking for.
I don't think it'll slow things down as much as you're hoping for, though.
It's about the number of orders you can make for individual or small groups of units, e.g. split attack orders so each part of your army blows one enemy unit in one shot thus not wasting DPS. The best example is Brood War pro player Jaewong who literally had 70+% win rate in a rock-paper-scissors called Zerg vs Zerg.
It's only 1 second or so, and lots of actions are off the GCD, but all you would need to do is extend that time and put more things on the GCD and you'd effectively get what you're looking for.
I don't think it'll slow things down as much as you're hoping for, though.