i'm under no delusions these would be implemented, but fun to ponder.
i came up with:
Bathing, inspired by http://www.gamesas.com/index.php?/topic/1183425-bathing/
Coins having weight, inspired by http://www.gamesas.com/index.php?/topic/1183383-gold-has-weight/
permanent effects of injuries. (e.g. get struck in leg with arrow, permanent reduction to movement speed)
need to eat
need to drink
common diseases
need to sleep
realistic weapon costs. (have you ever tried making a longsword?)
nudity
scarring (perhaps difficult to do...)
real healing rates
injuries (inc. bleeding)
okay, i had more, but i've forgotten them...
so, what else do you think would be possible to implement, and what impact would it have on the game? (for example, all my ideas together would make it just, unplayable.)
once again, i'd like to say, i don't expect, or want this to impact the development of the game in any way.
EDIT:
By 'ideal world realism', i mean if it wouldn't hinder development, and could feasibly be implemented, but not necessarily in the current 6 1/2 month time frame, ie, being developed in an ideal world..