iMovie slow-motion without that JES deinterlacer?

Hello,

I’d like an app that makes a selected part of a clip in iMovie ‘08 slow-motion. I tried the JES deinterlacer. Doesn’t work for me. By the way: that isn’t very Mac. Too complicated to use every time.

Are there any plugins to accomplish this?

Thanks. Davey.

B.T.W. Leopard compatible? :S