This lack of native support has encouraged the Shedworx guys to bring some simple trimming and editing features into version 2 of VoltaicHD which will hopefully be out in October. This will be a really handy feature as it will allow some very quick editing of files without the need for conversion. It will be especially useful if you just want to grab a small section of a clip and convert that for editing in iMovie or Final Cut instead of having to convert the entire clip.
So far they’ve got basic trimming features working and have published a demo movie showing how it works, all in all it’s looking to make VoltaicHD an even handier application!
Shedworx have released version 2 of VoltaicHD adding new features such as preview of AVCHD / AVCHD Lite clips, native editing of AVCHD video and the ability to upload video to YouTube. I’ve written a post with an overview of VoltaicHD 2.