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Hello Heri,
thanks for sharing the idea.
I've looked into it and did not find a way to reliably implement that
feature. iMovie HD does not seem to support AppleScript and I know no
keyboard shortcut to start / stop the recording.
But there still is a way for what you want to do: place the mouse
cursor over the record button in iMovie, then select the Virtual
Mouse in Remote Buddy and you can start and stop recording with the
remote. Not perfect, but it works and should do the job.
Hope that helps.
Best regards,
Felix