1) Color management refers to controlling the color accuracy of the display. Typically this will involve importing an ICC file, or performing a manual calibration sequence. KDE has a not-half-finished module (not included in the core package) for System Settings panel, whereas gnome and unity are fully functional and included by default.
2) You're probably not setting the DPI to match your display and using the default that results in text becoming tiny on higher-res displays.
3) It occurs when the setting is on "group when taskbar is full". It will switch back and forth when there are a few dozen windows on the desktop.
4) You can switch to double-click (as I usually do), but then you have a situation where, for instance, the icons on the main System Settings panel are doulble-click, but going down a level, say into Application Appearance, gives you another set of icons that are presented the same way but are single-click. Sometimes this switch shows up *inside* applications, making the overall UI feel goofy and inconsistent. On the one hand, single-click everywhere can be inconvenient and risky, whereas their implementation of double click is VERY unprofessional. They could simply show an underline on mouseover if the object is single-click and be done with it, but meaningful ques for the user are not this project's strong suit.
5) Yeah... really they should give people a way to get that sh!t out of the way; Better yet, choose a sensible default and leave it disabled so it isn't sticking wacky-useless icons everywhere.
6) The last time I tried, the new Konqueror's kio integrations were broken. The fact is that they trashed their two best-loved apps: Konqueror and Amarok.
9) Having used KDE since 2000, I'd say the project has a general problem with deterioration. They used to be the most reliable desktop, but lately it seems more like Gnome2.