I like these ideas. and all of them are seen in even the oldest metal gear solid game, but especially in 3 and 4. I think bethesda should take a couple pointers from hideo kojima about stealth as he created the best "tactical stealth action" game there is.
as far as stealth games go
Metal Gear Solid series > Theif > Splinter cell series.
and as far as all games go
TES series > MGS series > all other video games
(yes im a fan-boy i suppose)
How exactly is
Metal Gear's stealth better than
Thief's? For the majority of the series, remaining hidden is only a matter of staying out of the enemies' (ridiculously small) cone of vision, and from part 3 on, using camouflage. Noise was only ever a "sometimes" concern. In
Thief, light, cover, line of sight, and noise all have to be taken into account at all times. The AI was also much better, enemies would react more realistically once they knew damn well something was amiss; if any single person discovered a body, or even saw you, his behavior would change permanently, and he would remain on high alert for the remainder of the level. In MGS, once you get through all the various alert phases (Alert, Evasion, Caution, etc.), enemy behavior resets, and they go back to acting as though they don't know you even exist. I like the
Metal Gear series and all, but its stealth doesn't really hold a candle to
Thief's.
Really, "all" Skyrim needs to do to improve stealth is improve the AI, make it more reactive to "unwanted" stimuli, such as what it can interpret as strange noises, sounds of violence, bloodstains, dead bodies, and items appearing in places they really shouldn't. A system of various awareness phases is only the tip of the iceberg.
Though I guess stealth kills would be nice, too.