Thank you for providing us with another STS campaign.
I already noticed the rise of quality when playing STS 1 - 3. The third campaign is the best, that's for sure. So I'm really excited to try STS 4.
If you recover from the hard work, then maybe you will find a little time to rework the campaigns 1 -3 (especially the 1 and 2) for ACE version to make it fully compatible with ACE 1.1. I'm referring to the USP pistol bug, which occurs before every mission in STS 2.