Okay, I guess I will start off replying in order of your ideas. Just a heads up, my post may appear as negative, but I can say they are not to be taken that way.
#1 Yes (since it is optional to the player)
#2 No (it isn't hard to get 10 prof levels on a mule and transfer it over, why make the game easier)
#3 Yes (since it is optional to the player) ... personally I think it could get abused.
#4 No (I would prefer that different classes could detect other things outside of Trap doors)
#5 Null (If Paul could create this function where the items were RETURNED after a period of time [7 days max] I may say "Yes")
#6 No (the game already implements a priority based on the selection a person wants)
#7 No (basically with this idea you have extra mules to hold items and basically removes the value of a Vault)
#8 Null (personally, "highlighting" your class or identity in game is a waste of space, but, since it is optional, a Null from me)
In general, some of these have been brought up in previous posts. All I can say is, "if people are willing to spend $$ or fg for them, that is their decision", but personally, I would rather add in more content to the game first, then when player base is back to like 200+, maybe implement some of these.