Trimming H.264 QT-Files in FotoMagico

I wanted to stop a videoclip in the middle and let it pause till i click. So i copied the clip and trimmed the end of the first to the middle and also the beginning of the second. Then I selected to start transition by click, but it always plays the whole clip till the end. What can I do to stop the clip, besides trimming the clip in QT-Player and bring back in the two halfs?