Yes, I see it adding much dynamics in game.
Not necessarily only when you're stunned. Let's say you're in CA rushing to NG for a fight, just right when you pass grocery you would naturally change to enigma boots for higher dodge or PR necklace as well. And if you have to chase someone that is running, boom, 2 shortcuts and you're back in speed mode. Same situation for DW chesting.
But of course, accordingly to this, its a must that you can change equipment with shortcuts while you're stunned as well.
I think many players, including me left click a thousand times while walking/running so it wouldn't be a problem but same as the stun situation, I'm sure it could be modified so it doesn't stop your movement.