if you put the sensor on a really fast step motor, you can pivot the sensor a tiny bit in two dimensions, to get way more resolution out of it, at a loss of framerate, and you'll need to do some post processing.
Pixel-shifting is prone to some really terrible artifacting, particularly in shooting situations with movement (incl. any in-frame motion due to wind, etc.) Interestingly, whatever computational photography magic Panasonic is doing in the S1/S1R with their "multi-shot hi-res mode" appears to be far more robust in real-world shooting situations, even handheld. For those who care more about this, Lloyd Chambers has written extensive discussion and analysis of these systems at https://diglloyd.com/ (fair warning: access to the detailed analysis is part of the paid site, a few high-level notes are in the public blog).
something like this: https://chriseyrewalker.com/the-hi-res-mode-of-the-olympus-o...