Allow plugins to handle the scrub requests

@Zip,
Would it be possible that the plugin handles a "custom" scrub/seek request instead of ffmpeg? Right now, you add -s <timeinseconds> to the ffmpeg process. Some streams, however, like the Serviio Mediabrowser itself, use a custom argument to start at a specific time.
For instance, the fmovief site, which has http://blablabla.mp4 as "normal" url, and http://blablabla.mp4?start=<timeinseconds> to start from a certain point. Would be excellent if we can handle that using the plugin.
Not sure if this is a clear request, or if it's even possible.
Would it be possible that the plugin handles a "custom" scrub/seek request instead of ffmpeg? Right now, you add -s <timeinseconds> to the ffmpeg process. Some streams, however, like the Serviio Mediabrowser itself, use a custom argument to start at a specific time.
For instance, the fmovief site, which has http://blablabla.mp4 as "normal" url, and http://blablabla.mp4?start=<timeinseconds> to start from a certain point. Would be excellent if we can handle that using the plugin.
Not sure if this is a clear request, or if it's even possible.