Is it possible to drop the dependecy to "kdepim" in future? If you using thunderbird instead of kmail and like the integration of ark in the kontext-menu you must install kdeaddons and automatically kdepim with has 45MB and various not needed software.
kdeaddons doesn't exist in that form in KDE 4, so this will change a lot in Fedora 9 and later. For Fedora 8, it is probably not possible, as part of kdeaddons depend on kdepim.