Well, one thing to keep in mine is game balance. Say for fishing, if you add +1 to water tiles thats an extra food you are getting that on the current game balance you don't have. So, that makes the game easier after you spent the initial cost to discover native fishing. The cost of research helps balance things out somewhat. Another thing to remember is there is a 300 game turn limit. So, time is valuable and you have to spend your time researching things that add to what you are trying to achieve. Also, generally its better to make rule changes that make the game more challenging. If the games becomes too easy and there is no challenge it can get boring. Basically, we will have to balance out the FF, buildings, resources, and now Techs.
For example on balance, if we give a +1 to food for Native Fishing we should make Docks only give us a bonus of +1. This makes the game say +2 harder cause now you have to spend resources in Native Fishing to get the same +2 bonus. But, now we can add another tech like Native Fauna that gives us +1 to skins and that would help balance things out cause you are having to spend resources and time on both Native Fishing and Fauna.
Another thing is I want to work mostly with the Buildings and Resources the game already has and make a "Basic Tech Mod" so that we can all use that as a basis to Mod our other projects. And later on we can add things in like a "Health System" to help balance things out more and make an "Advanced Tech Mod". So with all that in mine I'll make my suggestions.
I like the techs you have chosen and here is the changes I'd suggest
Native Fishing: +1 food to food water tiles (docks only +1)
Native Flora: free Explorer1 to Scouts, lodge in jungle
Native Potato: +1 food center tile (from extra food source being discovered)
Native Citrus Fruit: Reveals Citrus (or Bananas) here I want to do something "special" cause Scurvy was a huge thing back in the New World times and thousands of people died from it trying to cross the oceans. And the sad part was the cure was all around them the whole time just no one knew about it. So, thats why I want this tech to give you a population boost as more people are survivng the trek across the seas. Like it is it gives a +1 population to all your cities. So, with this tech it would be a good thing to hold out until you have a few Cities established.
Also, just for future reference if we added in a Health System. Units that cross the ocean could have a chance to contract "Scurvy" until this is Researched. Scurvy would cause the unit to become immobile for a certain amount of turns
Native Medicine: this would help keep your citizens alive thus increase populations faster. Thats why I added the new tag for decreasing the Growth Threshold. I still like that for this tech and -10 is a subtle change and would not through the game out of balance. Requires Native Citrus and Native Diplomacy
Native Fauna: +1 to furs. if we add in animals (that would be cool actually) we can make a new promotion that adds bonus to attack/defend animals.
Native Diplomacy: requires Native Fauna and Native Flora. Only after you show interest in learning about your new environment do the natives truly want to talk. Better relations and time to research Native techs is good here
One new Tech perhaps
Native Spirit: requires Native Diplomacy. Gives Ranger2 to all your units
It's probably best how you have it, making different projects for every city could likely lead to issues with micromanagement or confusion anyway.
So, I really appreciate you're making it with moddability in mind.
), you could have the left and right sides of the screen display only all the techs from a single category, and the player selects which category to display by clicking on the categories in a single row along the top.
