[Alneyan]

I think it is indeed a feature, as SJ wouldn't have allowed for unlimited Emergency Build if it was quicker than regular build. This way, you have to put Emergency Build on, lowering your present build rates, in order to increase your building rates later on (once you turn Emergency Build off).

It is a very nice change gameplay wise, but sadly you cannot change the names "Slow Build" and "Emergency Build" as it goes the other way around here.