SUMMARY I am glad that finally in icons only task manager, if I use mouse wheel on grouped application, it is cycling trough only the instances of that application. My feature request is this option: If I use the mouse wheel on a non grouped application icon, than just activate that application. and don't cycle trough all applications. I think it makes a more consistent behavior.
I found this: https://bugs.kde.org/show_bug.cgi?id=327276 So it is "fixed" now:( Please add an option to work like as I described.
*** This bug has been marked as a duplicate of bug 427122 ***