Are those limitations still present with current 1.3.5 version ? Seems Marquis has been working on Sync Clips ?
Limitations in release (V1.0) (old)
The first version of Worx4 X can trim the vast majority of routine Final Cut Pro X projects. It cannot trim everything that FCP X can create, we want to be clear about this.
> Worx4 X will not currently trim either MXF, M4A(AAC), AC3, CAF or mp3 media files, the whole file will be copied.
> Compound or MultiCam clips are copied in their entirety, media file which are longer than these clips will be trimmed to the length of the original Compound or MultiCam clip. However, breaking apart Compound clips will allow the media to be trimmed to that used in the timeline.
> Sync clips that contain a video clip and one or more audio clips, which entirely cover the used portion in the timeline will be trimmed, Sync clips that do not meet these criteria will not be trimmed, but copied in their entirety. Breaking apart such Sync clips will allow the media to be trimmed.