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If i have code someClass::blabla() and below i press autocomplete on following code in code someClass::<ctrl+space>abla(); it will set not someClass::blabla()abla(); rubbish but correct string finally, just like it working at KDevelop.
Let me clarify: You have code someClass::blabla() you invoke completion at "|" someClass::|blabla() you choose 'method' from list and would like to see someClass::method() instead of current behavior where you see someClass::method()blabla() right?
Something like IntelliJ's "Complete with tab" feature (see "Finishing with Tab" on http://blog.jetbrains.com/objc/2012/05/appcode-code-completion-101/) would be most excellent. That way one could select on the fly between overwriting the rest of any existing symbol and inserting while leaving the existing text in place.