I've been one of the louder agitators on this issue, and I am satisfied by this solution.  I'd still be happier ramming my art down the viewers throats at full-sized regardless, but... well, that's not very friendly of me, now is it?  As you present this, it would seem that you are covering all combinations of desires.

I'm curious about the defaults, however, specifically for the viewer?  I would hope it will be "artists' preference", and allow users to then opt towards the two extreme cases, i.e. always small or always big.