Can confirm Favee's feedback on the other thread.
Here's what I've ran into so far on the test realm in regards to Black Powder Avenger.
-Couldn't take Improved Critical Musket or Pistol on 4th level Black Powder Avenger. The feat was there, but the two weapons were not in the list. I could take it on 5th level BPA.
-It looked like I could take the Signature Weapon 1 feat multiple times, to get both Musket and Pistol.
-Most gun characters rush the quick reload feats. But BPA level 7 makes them redundant. I'm not sure if waiting that long for quick reload feats is a good experience for a gun focused character / PRC. The earliest being level 12.
-Cleaning kit did not work on the default musket.
-Using Detonate causes a crash.
-Quick Reload feat not working for musket. Not tested with pistol.
-Slow from BPA Acid bomb is persistent until resting.
-Corrosion / broken weapons are removing the items permanent quality properties when fixed on an anvil.
Additionally:
-Gearling's Superposed Loading Technique/Quick Reload allows you to use "expired" Blackcraft bullets by equipping them in the bullet slot.
-Taking Weapon Specialization for Pistol or Musket as a Fighter does not count when you can take it or Greater Weapon Specialization as a BPA, meaning you can take it twice.
-I currently seem to get Signature Critical at level 3 of BPA. Just speculating, but it seems to appear at the same time Improved Critical becomes available, and Pistol or Musket is not an option for Improved Critical
at the same level, but becomes an option in following levels. The feats do not stack.
-Putting gunpowder into bombs (petards, concussive blasts, fulminated silver, etc.) changes their descriptions to not give any information about what they do. It also takes an entire powder horn to fully charge a single bomb, which seems to me like a lot.
-Succeeding the Reflex save on the Acid bomb still slows you. The slow effect from Acid Bombs stacks if you leave the area and enter it again or go into another bomb, in addition to being permanent.
-Concussive Blast deals damage to characters who succeed their reflex save and have Evasion. Evasion seems to work against all other bombs as far as I can tell.
-Using the "Recommended" button on the feats list during Level Up does not do anything.
-There is no friendly fire on Flash Powder.
-Spellcraft rank applies to saving throws vs bombs (But not powder kegs). Saves vs Spells does not.