Please consider adding new leader, same type as Hiawatha and Mansa Musa, with 50 skill levels and short research time. He/she would improve various oil economy things, but most important would be 30% reduction for oil skill research time in university and capstone would reduce all skill research with oil cost by one worker. Currently lots oil skills require 6-8 workers, and research time going up to 15 days. Museum spy skill takes even longer than that, 20 days. Even if you have DaVinci capstone, Atomium and Enigma Machine, research time is still ridiculously long.