Hi, from the dpreview review of the Q2 quoted above:
"The new sensor also brings about an additional 'digital frame selector' (crop) mode of 75mm. The Q2 offers 35mm, 50mm and 75mm equiv. crop options which result in 30MP, 15MP and 6.6MP sized files, respectively."
Of course, you get the angle of view of a 28mm lens, which one has to take into account.
This approach used with a 21mm lens e.g. might run into difficulties when making a 75mm crop, because 75mm is a typical portrait lens focal length. You might find faces a little round ...
So, with 28mm it is viable, especially for landscapes.