Set and unique items do not show up in the trade window in the act they are found. If you bring them to the next act, they will be renamed (they keep their stats) and will show up to be sold, if you wish.
Equipped items on the non-lead characters will not show up in the trade window.
The difficulty levels are Very Easy, Action, Tactical and Hardcore.
There is one summoning doll available each act. The first doll is a reward for helping the poisoned imp in the pit level of the citadel, who's brother asks you to kill a bony monster for its tooth.
If you didn't notice, there is a
patch.
You missed some experience and a couple quest rewards by not using the citadel disguise armour, but nothing you can't do without. Had you used the armour, you could have removed it at the end of the act to go back and kill everyone.
If you don't mind missing a couple quests I wouldn't redo the citadel, but you might want to reload a save at the end of the act and go back for the summoning doll. That doll is the only one that can use a crossbow (none can use a bow). Their limited range (without being upgraded) makes then useful for specific fights when you need help (which I took advantage of the last 2 fights of the game) or as mules (to carry loot) and trap detectors (they can trigger area traps, but not open trapped containers).
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