You cannot make a freeze frame of a motion effect clip. If you don’t want to Ramp to 0, then what you need to do is park on the frame you want to freeze in your timeline, matchframe (which may show the motion clip) and match frame again. This will give you the original clip in the source window and you can make your freeze. If you have effects applied in the timeline, step-into the effect and edit the freeze frame “under” your effects. Hope that makes sense and answers your question.
Ed
Avid and FCP Preditor
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Anything worth doing at all, is worth doing well.
– Philip Dormer Stanhope, Earl of Chesterfield