Would it be possible so that you can research using IC instead of leadership points?
What leads you to think you should be able to use industry to do research?
Actually HoI2 was also IC based, depending on how many IC you had you got the appropriate number of research slots.This was the way things were in HOI1. Unsurprisingly, it lead to people ridicu-tech-rushing by throwing all their IC into tech-development. I remember storming through France with Tiger tanks in 1939 (ahh, those were the days!).
The reason why this was changed to money-and-slots in HOI2, and then leadership in HOI3, is to prevent this kind of ridiculously early tech development. It's also not very realistic - people working on production lines are not scientists or R&D people, so why should they be able to help develop new technologies?
USSR was using research labs attached to industry, so labs had industry to test something and industry had labs to improve something.
I'm sure, historically, a country would set out specs for a new project and see what companies came up with and then awarded a contract to that company. So it would make sense for industrial capacity to be tied to research ability however it would be harder to balance since the USSR and USA (Which should both have a massive amount of IC) would get huge bonuses to their research ability.
I'm sure, historically, a country would set out specs for a new project and see what companies came up with and then awarded a contract to that company.
Actually HoI2 was also IC based