are there anyway to change AI to produce more land army?

[Severous]

In Alexander a barbarian faction that the AI plays has troop maintenance costs of €1 per turn.

All its troop types have the same €1 per turn cost.

I assume this was allow the AI to build up a huge virtually maintenence free army.

[Omanes Alexandrapolites]

Sadly Severous, in an R:TW environment, rather than the Alexander one, most factions are readily playable. This would allow the player to take advantage of the zero upkeep which results in the same unfair advantage over the AI.