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It would be nice if there was an option where one could associate activities to attached displays. So if I attached external monitor, it would open a new/predefined activity only on this monitor (and I could continue working within current activity on the main display). I think something like this already existed in earlier versions of Plasma (i think in the 4th generation and is not yet implemented in 5th), where one could select whether or not external monitors should map to different Plasma desktops.

In addition to that it would be nice if one could save some of the settings in a specific activity (i.e. if I change settings they should not apply to all activities). So for example if I switch to "Tutorial" activity, it would automatically unify outputs (since I want to do some live coding examples and it is nice to see what I am typing), and if I switch to "Presentation" activity it would break the unified outputs and run the PDF-presenter-console/LibreOffice Presenter/... with presenter view on the main monitor and the presentation itself on the other.

I've been running into tons of broken issues relying on xrandr + radeon/ati driver vs. fglrx managing it, where kde doesn't handle displays coming and going well. I'm dealing with 3x 4k displays that appear disconnected in sleep, and i'd like to keep apps and activities in certain places as you say, but kwin/plasma just jumble everything ugly every time the displays come and go at night or whenever I power them down.

At least cinnamon was good about keeping things where they were through that, but aggravated the drivers in other ways too. KDE tends to be better in theory if it actually worked right, but never has from 4.x, breaking a bit worse in 5.x so far enough I had to try something else, cinnamon, for sanity.