This has been an itch in the back of my mind lately. Have you ever noticed that when you're around the corner from an enemy you've never seen, it automatically sees you? I had this issue in a Dark City with a Trojan.
Stealth mechanics could be interesting, working in a metal-gear type format. Enemies would have a view range on the minimap, and sudden movements would alert them to your presence. This would also be the perfect way to implement walking, as it could be used to sneak around unsuspecting monsters.
And of course, we'd need a Toughbox shield. But instead of acting as a normal shield, it would display an animation of the Knight covering themselves with it and hiding.
That would be quite something.
I've been itching for a total of 3 ways to play the clockworks - stealth, speedrun, and action. We have "action" right now, but it would be really cool to have "speedrun" missions where we join the scarlet scouts, and "stealth" missions where we join the recon rangers. Such a change to enemy AI would be perfect for for the stealth portion.
For "around the corner" stealth I would say if enemies path to where they last saw the player then don't see them, the player is "invisible/unknown" to them again. They might do something like attack around the area too. However, such a change like this would have to have an effect on slimes that can see you while cloaked.