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While I agree that the left column is somehow a waste of space when a single control module is invoked, I do not see what is the problem with the height of the window. Even in the screenshots you posted, the Fonts module is displayed in full while the xserver is somehow using half the height it requires and adds a scrollbar inside to be able to see all the contents.
You misunderstood or overlooked my use of the word "minimum". Those screenshots are of minimum sizes the windows would permit, which isn't necessarily related to the windows' initial sizes, or any larger sizes that would obviate any need for scrollbars. For my usual use, scrollbars are *expected*.
http://fm.no-ip.com/SS/KDE/b317553kde.png is an example of my primary use of these modules. Because they can not be shrunken below an arbitrary minimum size, I usually need to place them overhanging the right edge and/or the bottom edge of the desktop in order to limit their display of information that is irrelevant to the reason for making the screenshot, and limit their blocking of information I want showing. If they were able to be sufficiently shrunken I would have considerably more flexibility in placing them.
Sorry for the late reply, lack of time.... Ah ah, now I see what you mean by "minimum". Not sure how much work this would require, we might have to modify all those modules one by one. In the mean time, as an alternative, have you ever tried the "Shade" functionality? This can easy hide windows when not required.
Cheers Michele