There is another way to get still images into FCPX, and that’s through iPhoto. It’s the camera icon you’d click on in the lower right pane of the FCPX interface. If you have 50k photos, it takes a while to index, but once it does, you can drag and drop directly into the timeline.
This method DOES respect the preferences setting for length of still images, unlike dragging a handful of stills from the event library.
What’s nice about this, is that if you use iPhoto to organize and touch up (red-eye removal, etc) your sill images, organizing them by sort order into albums, all that meta-data comes across in this pane, and you can simply drag and drop them in a batch to the timeline, with the durations all matching the FCPX preference setting.
Ben Hopkins