I'd like the permanent stone forts from the Britannia campaign to make an appearance...it would allow for much more strategic deployment of forces.

Also the boiling oil and such on the wall, as in the Retrofit mod.

If possible, I'd like to see Wales appear on the campaign map, although I know that might be pushing it :P

I do like your other two changes too - ballistas are next to useless because they lack any sort of strength. Sure, they can hurt multiple targets, but so can larger siege weapons...if I haven't got that option, I'll just plough with cavalry anyway. If it's possible, and I know this might be being cheeky, but I'd like higher-resolution textures on the general/captain models. They seem a bit out of place. A few look really good but some look quite bland.

I wonder if the Kingdoms format might suit the Eras mod better in that it wouldn't need a batch file to load only particular files so much? =/