you can setup an *.ini file to go with your *.pov file or type +fn, etc in
the command line box on the menu bar (next to the drop-down box for image
resolution).
I tend to put something like this at the top of my *.pov files:
// +H180 +W320
// +H450 +w800
// +H450 +w800 +A0.3
you can then right-mouse click on a line and have it copied to the command
line to render with those options.
jim