Agreed - that is why I have submitted the bug report linked
You could put it in as an “always” schedule?
@Peter - can you test the schedule grid with IE11 please? I haven’t noticed this myself before.
This is only useful if your Displays are in different time zones - i.e. lets imagine you had displays across in Chile, up in Brazil, etc. Un-ticked would mean that an 8AM display would be 8AM in each local timezone, ticked would mean that 8AM would be 8AM in one place, 7AM in another, 9AM in another, etc.
As a side note, in 1.8.1 the display software will send its timezone if it can.