i love hardcore rimworld and because that i like more complex game systems, this mod change all researchs and allow more to add more difficult in research, add a structural research called "Tools lvl 1", "constructor tools", "cooking tools" and a lot more, that allow basic sistems of the game, that cost little amount of work (arround 50 points) but, this add a need of little planification of the base, after that add some more complex research how "art tools", agricultural tools, crafting tools, archery, sharpen, and a lot more, i like listen your opinion about this
There was a mod that got discontinued and added item costs to research projects. So if you wanted for instance to research solar panels you'd need steel and components to kind of 'prototype' it.