couldn't it be possible to render at a higher resolution then shrink it down by popping the DPI up in Photoshop, PaintshopPro, or whatever your poison is?

So long as you have your ResolutionGate on -- you'll know exactly what'll be rendered.

I'll run a test tomorrow, its 1am here.

Edit: Never mind, I just needed photoshop, not Maya -- if you render at 4.17x the resolution both in width and length

Ex: 300x200 would be ~1240x830 (mental math)