A couple of suggested "iron man" rules

[screwtype]

I was also thinking about making the ability to train units dependable on cultural penalty, will have to look into that...

That's not a bad list Herakleitos. I think my own variations might be:

NO generals on foreign territory. Conquests made by Captains only. Either that, or mod general's stars out of the game.

Restrictions on mercenaries - no more than one or two merc units per stack.

I also like your idea of recruitment based on cultural penalty. I didn't think of that. I'm not sure if it would be viable because I don't know enough about how the cultural penalties work or how much they can be reduced in foreign cities.

Just a list of my rules I use for RTW.

Hmmm, your rules look a little extreme to me denmj.