What I mean for example is that something I notice is that every NPC in the game appears to be a master at what they do. Nobody makes mistakes, i'll tell you what I mean.

You approach a ruin and you got 5 bandits, they tell you not to come any closer. But, since you are a total badass you go up anyways, and they rush you. Now, what if one of them happened to trip on a rock? Or maybe that archer hits himself in the face with his bow string. That guy with a steel warhammer has just a bit too much momentum in his swing and falls over. Their trained wolf slips and flips over himself. That mage catches his robe on fire.

I think you get the point. I think not only would such a mod be hilarious as long as the chances for these are so low that on the rare occasion it does happen you notice it. But, it would I feel add a bit to the immersion, not every npc is a seasoned warrior, some of them should svck at what they do. Not to the point that the enemy becomes useless, but every once in awhile they goof and it gives you just the bit of time you need for that final blow whilst laughing your butt off. You could have a bandit with say 0 body weight who is weilding a great sword, fall over upon trying to lift it over his head, for example, because it is too heavy for him.

The level of the enemy and the archetype, [bandit vs bandit marauder, novice fire mage vs master fire mage] could factor into the likelihood of a mistake. As well, the rarity could be fairly rare, say, 1 out of 25 bandits you come across critically fails at something. Also, not just bandits, but all hostile NPC factions could suffer fro this, as well as some guards even.

Such a mod would be awesome and add just a little bit of immersion I think.

I agree that I'd like to see more, but I do see NPCs making mistakes fairly often. Setting off their own traps in caves. Tripping over (and dying from) their rocks at Robber's Gorge / Falkreath Bandit Bridge. Mages that kill their tanks, archers that aggro their trained dogs. I've seen it all. I would like to see it more regularly but NPCs are pretty dumb to begin with so perhaps not too regularly!

Well, those are mostly from limited AI, but yes I agree. But when you see people die from their own traps [walking through boulders for example] you instantly go "oh yeah, the ai in this game svcks". But if you see a guy trip from nothing or drop his weapon or something, thats not generally something that would happen because of ai limitations. So, in my view it doesn't immediately scream "bad ai", it screams "that guy made a mistake" Get what I am saying? We know he can't help but walk through the boulder traps because thats how the ai works, but he can help dropping his weapon or fumbling... so if he does it its "his fault" not the game engines fault. Of course, this all assumes the player has an imagination.

I do see it, it would be a lot better if that happened instead of what happens at the moment.

Uh every suggestion you made makes them useless

Tripping on a rock once doesn't make an enemy useless. Unless you kill everything so fast that that one trip is enough for you to finish him. A fight for me even one on one can last a good 2 minutes with my mod set up. A few seconds of town time is hardly enough to make them useless. A minor paralyze potion has the same effect. Also, not all effects would actually render them disabled, for example the mage that burns himself, he would get an effect of like 2pt of fire dmg for 5 secs on self, or something. Does pretty much nothing to him.

You would go through waves and waves of enemies before you even seen anything occur anyways so how large/small the effect it has on an enemies uselessness is wholly irrelevant.