- Forced Diplomacy: Take lands from factions that are to strong and give it those that are close to destruction

- House Rules: Use all kinds of rules to not exploit the AI stupidity. That also applies to the tactical screen; keep battles as simple as possible, try to avoid battles with AI reinforcements, don't lure its cavalry into your pikemen etcpp.

- Long Sessions: Decisions are not saved for the AI. You might remember that Publius Aemilius Paullus and his army outside Segesta was heading for Mediolanum when you load your game the other day - the AI doesn't! With everytime you reload a campaign you'll have more and more AI stacks standing idle around.

- Battle Formations: There are several files around for AI formations, like the EB version, the Vanilla, Darth's mod, Sihunet's etc. Try them out and play with the one the AI preforms best against your style of fighting.

- Do not ally with weaker factions: My latest discovery; it is much more likely to be attacked by an ally than by a neutral faction, even if the ally is much weaker than you are. In M2TW we are able to mod the AI diplomacy and might be able to stop this madness, but in RTW you should avoid alliances with AI factions that won't survive for long in a war with you.