For workers I could imagine having something like that. Not so for scientists, because this would mess up the complete timeline and make the game even harder to balance.
if lets say scientist at 100% skill would have somewhere 10% bonus that would not be so much to balance. but it would make him more valuable.
also if there would be more different skills there should be a way to choose each scientist/worker so you know who is who. some names for scientists/workers would be fine too.
i think i read that there was something about suggesting some delay between buying and receiving bought items (weapons/ammo..) so it could be the same for workers. you get new worker only after few days you hire him.