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Currently there is an option to assign different activities to different desktops, as well as an option to assign an activity to the dashboard. I think it would be also nice if you could assign activities to the top and bottom of the desktop cube when using the cube plugin with kwin. Currently the top and bottom, if they are not transparent, are just wasted space. But you could stick widgets there that you could see through the transparent cube or if you rotate the cube up or down. Putting interactive widgets there would be useless since you cannot interact with the top and bottom of the cube (you can only see it in cube mode), but putting clocks, status monitors, picture frames, and other dynamic but non-interactive widgets there could make that space useful. There could even be a shortcut to quickly switch to them.

There are two problems I envision. First, how do you orient the activity? I have three ideas for this. One is that it is oriented so it is always at the correct angle when looking at it from the first desktop. The problem with this is it will be at the wrong angle much of the time. The second idea is that it is always oriented so it is the correct angle for the current desktop. How this would work is that when you exit cube mode and go back to the regular, 2D desktop the top and bottom activities immediately rotate so that when you enter cube mode again they look correct for the current desktop. The third idea is that as you rotate the cube the top and bottom activities rotate with it. I think this would look weird. I personally prefer the second idea, I think it is a good compromise between usefulness and aesthetics.

The second is how you would configure the applets on the containment. I think this would have to be done from the cashew, perhaps a "configure special containments" menu with options to configure the dashboard, screensaver, and top and bottom cube containments, as well as any others that are developed in the future.