@Trade Winds:
The nice thing about modding friendly games like Civ4Col is, that you can easily adjust them to your personal taste.
You do that, and that is great.
I will give my comment to one point you mention, if I may.
Resources (or yields) being more strategic:
Well, the general idea has been discussed several times.
Of course that does sound interesting, but one major aspects needs to be considered:
AI.
Simple truth is, that Civ4Col Vanilla AI is damn stupid.
Mods (e.g. TAC or RaR) have tried to improve that AI and achieved to make it a bit less stupid.
But even after years of modding of a whole community AI is still
not able to really plan ahead and think strategically.
It is still simply very reactive for the most part. In many cases its decision are even influenced by the outcome of randoms.
So when introducing complex concepts that are really important for gameplay and require some strategic thinking, you only have 2 reasonable approaches.
(If you don't, your AI is broken and the mod is not fun to play anymore. Most complex features use a mixture of the 2 following approaches.)
A) Try to implement some AI logic that "simulates" strategic thinking.
Very hard to do, since there are so many cases you might need to consider and implementing complex logic in a performant way is also not that easy.
Only a few of the best Civ4Col modders considering programming have ever been able to programm good AI logic for complex features.
And even those "experts" spent many many hours of implementing, improving and fixing logic for such complex concepts.
B) Have AI play by easier rules or simply let it cheat.
Usually that is not that difficult to do.
However, it is also not very satisfying to know, that AI is simply given easiers rules or just cheating.