heres a nice plugin to make

i run my screen res rather high, and so i get the choice to either render my samples at
a small size (normal size, that the end pic will have, but only 50x50 pixels) and view it
on my monitor, which looks rather small, and not easy to pick out fine details
or use a 2nd camera and zoom in on the object, and render it around 100x100
doing the latter adds render time though, and trying to avoid that

when we render a pic, we can already pan the image around
so how about letting mouse wheel zoom in/out? like most image editing software
i know what enlarging does to a pic, i can easily accept that, but be nice feature