I don't think that options exists. At least I have never heard of it.
I have never more than 5/6 icons and thats all standard KDE apps. Can you tell me were did you found those apps?
I prefer to have an applications in the tray than buttons in the taskbar.
I did not hear anywhere. Just I wish this feature. In my opinion, this feature is the most important but there isn't. I dont understand KDE sometimes....
maybe sent in a wish to the kde dev's... I think it might be cool.
and there is also some hack that allows the icons to be under and above each other - which is nice, too, I hope it will be in KDE 3.2.x asap.