[atharmian]

@Lunatixz 

Ok thanks for the detailed replies.

1. Another issue: multi-PVR operation (and Nexus multi-instance PVR + multi-PVR operation.)

From some confusing discussion in another Forum thread, it looks like multi-PVR means assigning different playlists to different PVRs installed/enabled, and then using only one PVR as output.

2. I am assuming this default output PVR is PVR Simple (which you use to output), and this default cannot be changed.

There was a suggestion to do some configuration with the sidebar menu, but ATM the LibreElec repo (hosting PVRs) is down for 18 hours from my AE-PCx86 11.1.10 Nexus build, https://alexelec.tv/
So I can't check for now.

3. So how would this multi-PVR scenario affect PTVL operation? 
That is, user assigns addon VoD/playlists and m3u playlist sources to PTVL, but user might also be using other PVRs.

So how would this single output look like in Kodi- > TV ?
What I have learned so far is that multi-PVR channels are all aggregated in a unified Guide, Channels List in Kodi >Live.

But it is not clear to me how to configure output(s), since Kodi >Live TV gives no indications of what PVRs(s) are enabled. However  Kodi > PVR &Live TV > General has sub menus for looking at enabled PVRs from the Repo list, and assigning them priorities (which I don't know what to do with !)

I am looking forward to PTVL Stable soon ! Nice, much desired integration.