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My idea is simple and don't need screen shots or video.The Kde have this feature to paste anything copyed on the clipboard with middle mouse button... this feature is very useful for web-browsing and stuff but the idea is the following: Kde must have option somewhere is system settings to disable this feature becouse some people have very sensitive mouse device's or people who do a lot of writing, developing and stuff and this feature only make their work harder.

Just wanted to point out that pasting on mouse middle button click (or Ctrl+Insert) is X server feature, not X client's (i.e. KDE SC). Why do I think that's a way things are? Because it works on every window manager and desktop environment I know .
I don't know a thing about X programming, but it seems that KDE must capture mouse-click event and do not send it to X.

Klipper has some features involving X Selection mechanisms, so looking at it's source code may be a good place to start, if anyone volunteers to write patch for this idea.