Fully implemented multiplayer world (campaign or like in PWMod, or even both ?). It would make the game really nice, but it would require some other things like others mentioned beore my post, like buying EQ for soldiers. Also, maybe... Kinda randomer type of recruitment like in 1257 AD lance system? In example u go to village and elder says that he believe that there will be 4 strong men (1 or 2h meele), 3 agile shooters (bows xbows throwarms) and dunno what else, in cities surely guys with horses. It should be more categorized,
like:
village: 1h ,2h, polearmers+/- with shield, bowmen, throwarmers ,light armors.
town: 1h + shield, polearms +/- with shield, xbowmen, cavalry, medium armors.
Castle/Court/Rich district - Truly heavy bad boys with 1h+shield+lance and damn nice horses.
Of course it can differ from factions etc.
Also, tree would be more specified.
For example let it be faction of Calculators ( :p )
Calculator Recruit (V)illager - Calculator Skirmisher - Calculator javeliner-Calculator bowman
\Calculator light infantry - Calculator blunt carrier-Calculator spearman
\Calculator Woodcutter/axeman