I’m not in front of FCP and I’m not sure if this will work correctly so here goes:
I would first select the clip and copy it, drag it to the length you want, then hit option-v (or the paste attributes menu item under edit) . A dialog box will pop up, select the keyframes you need to copy (such as basic motion, opacity, etc.) and make sure the “scale attribute times” tickbox is checked at the very top of the dialog box, that will scale the attributes to the length of the clip.
Hope this works and helps.
Jeremy
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G5 Dual 2Ghz <> 4GB RAM <> FCP 4.5 <> Kona 2
ATTO 42XS <> Huge Systems 1.25 TB 4105 Fibre