There is a checkbox in Ingest window in PM that makes contact sheets open in background during the ingest, which is a very useful thing, because it allows me to work on something else while new ingested tabs are being opened.
I wish there was a switch that made all of the new tabs open in background, unless there are no tabs open at all.
Why this is useful?
1. As mentioned above it will allow to continue working with current tab without interruptions due to other apps opening tabs
2. Ligtroom is the least of two evils that does this, because Lightroom triggers "open with app" after it finishes the export, which happens once per export.
3. Capture One is the main offender, because it triggers "open with..." after each photo, making it impossible to work in PM because each new photo steals PM focus.
I also wrote to C1 Support to add switch that triggers Open With similar to Lightroom.