First off, great mod, Eothese . After playing the Americas expansion, I thought how cool it would be to invade Europe as the Apaches or Aztecs and making more of North America available.
I found a few minor bugs in the 3.3 version and I even saw one of the them mentioned in the previous mod version bug reports. So far, all the gunpowder sounds have both gunfire sounds and arrow whistling sounds, including both Apache gun units and Spanish dragoons. You said you used some gunpowder units and you didn't hear it, so maybe it's a selective issue.
And also, the villages in North America aren't tipis, they are Mesoamerican, even though all the units, the faction Apaches and rebels, are all Apache units. And the last thing is no subtitles for the Apache factions during battles (telling you about half the troops remaining, morale, winning the battle, etc.)
Overall minor issues to what is a fantastic mod that doesn't at all break it.