Yes, but not in a traditional "bake all actions in a batch way". I personally retargeted 50k+ frames, addon is capable of retargeting super long animations. Here's how to do it: I just put all of the actions into a single animation sequence, then bake in chunks (I added a final baking in chunks option so to prevent blender dead freeze). Just use "bake forward" within the frame range, and bake in chunks on final stage when you are ready to finalize and disconnect your rig completely. There a few buttons like - Bake next 100 frames, or bake 500 frames, or bake 1000 frames. Even 1k frames takes like a minute to bake, so it's pretty fast. Once you have a massive long sequence of animations - you can manually break them down into actions, depending on your needs. Baking in chunks is convenient because you don't loose your progress and you can have full control over what is happening, bake a chunk, then save the file when you are confindent. then bake another chunk and so on. As I am writing this, I just baked 6k frame sequence in like 5 minutes.

Yes. After using Finalize & Disconnect, the final baked action can be used on other Auto-Rig Pro characters. So it's a great way to collect entire animation libraries for yourself if you are a daily AutoRig-Pro user like me. Note: If the character does not move after assigning the action, check Blender’s Action Slots. In newer Blender versions, the action may be assigned to a different slot.

Pole markers and root motion are usually better adjusted manually, because they are sensitive to the specific animation and character motion. In most cases this only takes a few minutes, and gives cleaner results than trying to fully automate it.

No, for now finger and facial animation are not included. The add-on is designed to generate a fast animation foundation that can later be refined and polished by hand.