Hi sph33r,
It looks like Tom has pretty much given you all the info you need 😊
I've certainly stop drilled cracks in hot areas, exhaust sleeves on 1 of the engine types on the A330 (I can't remember which one) and turbine rear frames on CF6-50s.
I know very little about helicopters so I can't really be of much help, but airframe and engine standard practices don't differ too much, I've no idea where you heard "stop drilling is not allowed in hot areas, on any aircraft, anywhere" but it's not correct.