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Idea should increase security end enhance UX.
This idea is important, because some medium user could trust (like one's cell phone) and another not (like usb stick).

When user insert removable media first time, system should asks what to do and about additional integration for this medium. It should also ask to remember selected action.
Integration should be (for example) display file previews. Action could be (for example) start autorun. I known on Linux autorun script are rather rare, but maybe it could be useful?

If user trust ones cell phone, he/she could select to display image/movies previews. When inserting usb stick of friend, user could keep some options turn off. When user insert CD with game or presentation, he/she probably would to ask Plasma to always ran autorun, when inserting this medium.