My own wish list for Santa is:
1. Diplo-Annex. In fact, I'd _really_ like to have the later kind of treaty, where a thoroughly defeated "ally" would get to hold on to his throne and country intact until his death, then it's automatically inherited. Give it nationalism, revolt risk, etc. Require 100% war score, if you must. Whatever.
But, at the very least, please give me the old vassals and diplo-annex back.
2. Please, either (A) add _much_ more women, or (B) remove them from the game completely and replace them with automatic placeholders so the guys can have children.
3. The ability to build improvements in a client state's territory, on my cost. E.g., if Massilia doesn't or can't build a port, meh, I'll build it. The Romans actually did that more than once.
4. Area recruitment. I find it interesting that I can recruit barbarian troops from neighbouring cities, but I can't recruit those cities' own troops. E.g., if Rome imports wood and Campania imports iron, I should be able to recruit Principes in Rome, and Sagitarii in Campania. Effectively, they'd be recruited in the neighbour city which has the resource, just show up in the city that ordered them.
I know, I know, I can recruit them in Campania and march them to Rome. It would simplify the process, though.
5. I sorta understand the no-need-for-CB rule against low-civ tribes, but _some_ restriction has to be put in place against Carthage DOWing some German tribe in the middle of continental Europe. Maybe actually need a border _or_ less than 3 sea zones to the zone you're trying to attack? I mean, seriously, there's no way either Rome or Carthage could realistically hold onto a city that's 2000 km past hostile tribes.
6. Can we have the Trireme renamed to Quinquereme, please? I mean, seriously, unless I remember Polybius all wrong, that's what was used in the Punic Wars. I mean, the Trireme were essentially obsolete past the 4'th century BC.
7. Two tiered governors. The Dux was really for a whole "duchy", so to speak. You'd have a Dux of Gaul or some other suitably large zone, but the equivalent of the small provinces in EU:Rome would have a prefect or procurator.
As an easy enough to recognize historical example: Pontius Pilatus was a procurator of Iudaea, but subordinated to the legate of Syria. Pilatus didn't have a legion, either, it would be up to the legate of Syria to march the army to Iudaea if needed.
8. Speaking of the above: auto-intercept. Let me set an army on such a setting, that it automatically moves into adjacent zones if they come under attack.
Extra historical example: the (much later) limitanei, which were supposed to hold the border until the heavier troops and cavalry arrived.