I checked in VPX6 and I have no problem whatsoever of moving an audio object to anywhere within a frame of the video.
The frame is the smallest that you can have. I highly doubt that Serif, being a run-of-the-mill commercial video program, would be sophisticated enough to allow you to move one video image a half frame to the right vs another video clip and get it right. With multiple cameras, you will never get exactly the same image at the same time unless they are synchronized electronically together. I think that we have established that you cannot move a video clip by less than a frame if you could the resulting video would be terrible. It didn't seem to have any effect whatsoever. I tried switching off "Object Grid" thinking that this might be the equivalent of Serif's "Align to Frames" option, but no joy.
I'm enjoying getting used to MVP 2015 Plus, and it does produce excellent, satisfying results. I believe they re-render everything at output regardless, (and they do indeed take ages comparatively speaking to create output), but perhaps it gives them more freedom in actually how they work. Serif clearly have a different internal mechanism for rendering to Magix. If the only adjustment you have is at frame granularity (in my case with PAL +- 20 ms) the job is harder! My main work involves long continuous takes of live classical music concerts, and my experience is that getting soloists (and strangely particularly choirs) to look as if they are properly lip-synced can be tricky. If you are trying to juggle multiple free-running cameras (each deciding its own time reference for the start of frames), and maybe sync up to a separate audio master, I found it makes the job easier in post if you can 'slide tracks' around a little. The European Broadcasting Union Tech specification 3307 specifies that audio/video sync should be within +5ms and -15ms (early and late respectively) to decoded video. Don't get me wrong, this is not a life and death issue for me! The Magix solution has a lot of things going for it - but there have been occasions when the Serif ability to switch off a track's alignment with the timeline has saved my bacon.
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