Welcome back!
I use commercial skip for all of my recordings. To set at the DVR level, in Plex Web go to Settings -> Live TV &DVR, then click “DVR Settings”. Scroll down to the bottom for “Detect Commercials”. I use the “Detect and Delete Commercials” that has been around for a couple years and it works well for me, but there was a strong request from the user community to have a non-destructive commercial skip that is now available as the “Detect Commercials and Mark for Skip”. Also set Commercial Skip at the recording level. In Plex Web open a recording, then click “Show Advanced” and scroll down to find the “Detect Commercials” option. I haven’t used the new option “Mark Commercials” option, but I think as you are watching it will prompt if you want to skip where a commercial is detected.
As a side note, auto skip intros is now also available.
Allowing deletion for a specific library isn’t yet available, though there is a feature request here that you can vote for if it is important to you.
I can’t speak to the IPTV request - perhaps someone else can chime in.
