Ok, I changed it to use only one of the three. A bonus of over 100 (3 Caretakers+ Foundry+Scientist+Scientific Method) feels like a bit too much.
So; I thought about it and looked over how the Actions could be used. And, well things could get strange if we shift enough Actions around.The shift is permanent, until you shift the Action back. A category cannot have less than 1(one) Action.
It doesn't matter too much as long as the Category that gets extra Actions is limited by something else, like Material cost(Faith and Tree Actions), Goodwill cost(Military), or simply time because every project takes 2-3 Turns(Diplomacy). But the Categories that aren't limited like that(Archeology and Learning)...
We could shift things around until we have 4 Actions in one Category. For Learning, that means we could do 1 big project that gets 3 Auto-Success, 2 Actions could be used on theory work to reduce DCs, and 1 Action to do "easy" projects. What counts as "easy" would change rapidly because we could get most of the basic theories over 2 or 3 Turns. The Cargo Transporters project for example could get 6 different theories applied to it.
And then there is Archeology. Dear god, Archeology. We could use 3 Actions to organize Expeditions and use the last Action to explore new areas for even more Expedition targets. We could easily end up with a dozen Expeditions simultaneously. That would flood Mirn with Artefacts.