The limits of the original RTW engine severely restricted a number of things we wanted to do. The major one would be the number of factions. You'll note that in RS3 you have the ability to play factions 'other than' the main ones that were built into RS, like Galatia, Bithynia, Athens, etc. But the only way we could do that was to remove a faction (Sparta), and set that up as another faction. The ability to do that was set up (on purpose) in the EDU, DMB and EDB files so that all the units were there to be used. But, we were limited there as well because the unit limit was 500, and we used them all. Basically, we jumped through hoops, fooled the engine, and coerced RTW to do what we wanted. But all the limits made things very hard, and in some cases, impossible. The game also limited the number of 'objects' you could place in a settlement (I don't know what it is exactly, but I hit it
), and the number of buildings you could even have IN the game overall. I hit that to. It was probably because the engine couldn't handle any more than that without choking on it's own EXE....but yeah, removing\expanding limits will be very helpful for future modders. You wouldn't need all those modfoldered campaigns to add factions. Yet another beef was the map. Some people, I imagine, never cared about the number of regions and settlements, but in my opinion the ability should be there to add as many as you please. I used to joke with the team that I wanted to be able to kick China's butt with the Romans....but alas, it couldn't be.
The only way to make a map that big was to shrink everything down so small that it wouldn't be playable IMHO. Anyway, it remains to be seen what can be done with the map.