"Edit trackers..." dialog questions and ideas 4.3.0alpha1

4.3.0alpha1, libtorrent 1.2.10.0, Windows 10

I see when i select multiple torrents there is convenient right mouse click menu entry and dialog "Edit trackers"

I was not sure if i can append tracker list with trackers that already exist in torrents causing duplicates. So i pasted one tracker 3 times in the list and submitted, the particular torrents shows only single tracker. But when i right click this torrent and go to "Edit trackers..." dialog again, it shows that tracker 3 times...
The dialog is talking about tracker groups/tiers, but when i prepend 4 trackers from same domain, only with different subdomains and announces, and add blank line after. then submit, i see in tracker list all tried to connect to a tracker, i expected that only first one connect and then second if first fails..
when i selected 474 torrents and clicked to "Edit trackers" it returned empty list (because found no common trackers?). I think this also happen sometimes when i do it for just couple of torrents.
when i did it for 5 torrents, it shown incomplete list and was missing at least private trackers. It is showing only common trackers likely. It seems not logical to me, i would rather expect it will show all all trackers found in all torrents. I tried to submit this incomplete list and it indeed apparently updated all torrents trackers and left only those that was common for all. I think this is risky behavior and rather all trackers should be shown instead of common ones?
It can be good if in the dialog is a button "Deduplicate & sort" button which will:

sort not by first letter of the line (udp,http), not by sub domain name, but by domain.com, then possibly by subdomain
remove duplicates (including those that differ only by http/https and ending slash/missing ending slash)
where detect multiple trackers under single domain, add empty line before the first and after the last making groups
possibly the trackers with = in address are private ones and maybe one would want to have these on the top of the list

Another idea for Edit trackers box:

when i select lets say 1000 torrents, right click to edit trackers, maybe i should be able to tick the radio buttons: a) "Remove following trackers from all selected torrent/s" b) "Use following trackers in all selected torrent/s"

qbittorrent / qBittorrent