This request is something I've wanted for a long time and others have asked about it as well.
I'd like the ability to buy extra strength production. Something along the following lines:
+1 strength for +25 gold
+2 strength for +50 gold
+3 strength for +100 gold
where the gold needed is cumulative so to get +2 strength you'd need to spend 75 gold and +3 you'd need to spend 175 gold. For 3+ turn units that cost can double (+50, +100, +200).
This would only be available when you actually buy new production in the city (not later as an upgrade). So when you click to buy a Lt Infantry for 100 you'd see options to add extra +1 strength for 25 gold, +2 strength for 75 gold and +3 strength for +175 gold. This can be something as simple as radio buttons on the 'buy' screen showing 10 strength - 100 gold, 11 strength - 125 gold, 12 strength - 175 gold, 13 strength - 275 gold.
Neutral city army production can also be potentially randomized to give extra production strength with a formula something like 50% - normal, 30% - +1 strength, 15% - +2 strength, 5% - +3 strength.
This would bring Warbarons into line with all prior warlords games where extra strength production was possible on units.
KGB