How to discriminate vertical from horizontal scroll on Kubuntu/KDE mouse action for switch Desktop

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http://askubuntu.com – Currently trying out KDE, and I'm a big user of multiple workspaces/desktops while I work. I've noticed that essentially, KDE isn't able (or doesn't bother?) to tell between my mouse's standard vertical scroll, and the left/right scroll that it has. Just FYI, my mouse has a pretty sensitive scroll wheel with no discernible "clicks" so I can easily make my desktop look like it's on crack. Here's what I'd like: vertical scroll does nothing when applied on desktop, but left/right scroll causes me to switch to previous/next desktop. Here's what happens now - per settings for Desktop Settings (HowTos)