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I second this, though I would be happy with a "preserve
aspect ratio" checkbox like the hardware GPU's. But that's
just MHO. :)

From a quick browse through the code, it looks like all that
needs to be done is to copy some of the math from
NoStretchedBlitEx() into the StretchedBlit2x() and/or
NoStretchedBlit2x() functions in draw.c, but I may be wrong.
I may look into providing a patch to implement that if I
ever find some time to truly sit down and figure out what
exactly is going on in these functions, but anyone else is
invited to preempt me... ;)

Any chance of getting confirmation from one of the
developers that this is the right path to take? If not,
where should I look?