I've searched for a mod for this, and couldn't find it - but having the ability to change the overlay for turret overlap color would be a good quality of life improvement.

For example, the current red color overlay could be left as is, but an option to change them per turret type would be nice ...

Thanks for the replies, I actually managed to make a mod doing just this with extreme ease!

Here is an example of what I wrote into data.lua:

table.remove(data.raw.technology["steel-processing"].prerequisites)
data.raw.technology["steel-processing"].research_trigger={
type="craft-item",
item ...

I've been obsessed with the idea of trigger technologies, and I've seen in mods such as Muluna, building a rocket silo requires building 100 logistic bots in order to unlock the technology.

I looked for this kind of mod already, and I don't have much mod experience besides the Fire Armor tutorial ...