When you add a single lesson to an existing set timetable, the set name and teacher default into the Teaching set tab of the window. However when you use the Group add feature to add several lessons (for the same set) the info doesn't default in. You have to scroll through all sets to find the correct one - even though you are in a specific set !
I am promoting this idea to use as part of planned work to modernise the Teaching Manager module. This body of work will overhaul the legacy user interface which will include a full review of existing workflows in conjunction with fixing inconsistencies in the UX/UI