1) well its not all to hard to script that in the game, but frankly for the mean time unless the seige has a seige tower they will charge like itdiots but you can order then around with the battlefeild commands.
2) well if you look closely one of the ladders will be swarmed with enemys the other won't but you can add the second ladders in if you want, at the moment im trying to work on how to edit the AI mesh so that the AI will actually go up the ladders. oh and its not easy to defend when the difficulty is on normal when one arrow could kill you, or 5 hits would kill you.
3) what is the point at having walls if your gonna have all you possesions and buildings outside them?, the wall is to defend the interior, thus having it detailed betters the atmosphere making you feel like you actually defending something.
4) yes well it in that case we would have to completely redesign the siege script and a add levels of importance to the troops so that the computer dosn't place random like it is set now.
5) firstly its easyer to hit the enemys that are coming up the wall and secondly there is no script that confines archers to stricly range combat, if there was the eventually they would be walking backwards into a wall while you close in on them (that is if they ever run out of arrows and noting there quivers get refilled every minute)
A) unless it was like a unit and the gats had hp and stuff along those lines, it yet to even be thought of.
B) get the machines of war mod, its got seige weapon, only working on two castles at the moment but its great fun.
C) what is the point of havin swords and bows if your just gonna sit fireing catapults and secondly its not gonna happen, as stated above get the machines of war mod its great but no batting ram of the abilitie of firing the seige weapons yourself.
D) sadly they did in the first place thus making a easy seige for you, thus they will again to make it an easy seige for your enemys and secondly, why would you pay to get it repaired you own the god dam city or castle.
C) beacuse in those real battles they had like almost a thousand men, where as we only have like 50 and if you were to try using this ingame well all ya men would be dead by the time the ladder is placed and then it is all over.
just to note almost all these have been mention heaps of times, use the search option, and either way i even mentioned almost all these ideas first time i came on these forums.