@JP-d I appreciate how you would like the Pause time included but I sit on the other side of the fence & definitely don't want it included
so I think @white.mouse suggestion to have an option would be the way to keep all happy
for me the ETA is one of the most important pieces of information when leading a group
I don't expect the ETA to be anywhere near 100% accurate, but as long as I can see the ETA is not growing (getting later) by a huge amount then I can judge when I will arrive
If it is growing by a large amount then I know I need to change the plan & take a more direct route
for me having the pauses included as @travellexxie says the Garmins do, causes all sorts of panic in members of the groups I lead, as they often see late ETA's which I know from experience we will easily arrive earlier
You cannot trust an ETA it is only an "estimate"