On point 1 - I agree with molotovs/rifle grenades in their current state are both too powerful and "no brainer" abilities because of their low cost. I'd really like to see them become more of an investment so that there is more of a choice when using them. I'm not sure drastically increasing the tech cost to obtain them is the right way to do this, but I agree with your general premise.
Constripts are no-brainer farmers and need no-braine abilities.
Early game is good, but 1CP elite infantry is much more problem.