If you want to take things into your own hand you can modify game difficulties fairly easy. The games vision cone is defaulted at 90 degrees, you can modify it well above that to make it so you can't basically steal with anyone in a room, which is probably a lot more realistic. However there are some exceptions to that.
I don't know what this does for invisibility since it don't have that skill, I'll give it a whirl though to see.
I use 500 degrees, because there was still enough of a sliver for some reason behind a NPC you could still sneak successfully in. 500 wipes that out.
I don't know if this can break the game in some way in some type of mission. What I do is modify the three difficulty levels. Hard 500, Normal 240 and Easy 90 (games natural default), so if I had some place I had to have only 90 degrees cone vision, I can move to Easy really quick and do that and then continue. I created an Easy that is more like a setting to help if I get stuck, lots of extra perception etc in Easy, in the case I can find something important.
I can assure you though, you will not go into any area with NPC's and steal. It does seem a lot more realistic. Now you have to get them out of the room or do very bad things to them.
Last edited by Horrorscope; 22/07/14 01:30 AM.