Thanks for your quick replies. Can you elaborate what you mean by "user side trick"? Also, any plans to add support for this controller? I have two of them and would prefer not to buy new ones.

I am currently using Retropie, but considering to switch to Recalbox as I have been reading good things about it.

Before I do the switch, I'd like to understand three things. Would be great to get thoughts from the community:

1. I have a bluetooth Xbox One S controller, which largely works with Retropie. Only the select button cannot be mapped. Does Recalbox support Xbox One S (bluetooth) and does the select button also works?

2. Is on-board bluetooth for RPi 3 supported now?

3. So far, I am only using one Xbox One S bluetooth controller. I am considering to buy 1-3 more to play multi player games. How do I need to map the 2nd, 3rd and 4th controller?

4. I am also planning to use moonlight to play PC games. I read about many issues related to multi-player support. Will the controllers work as mapped in Recalbox or do I need to somehow map them again in Moonlight?