Most games open on their own screens, so unfortunately
they will not work on a VGA type monitor unless
scandoubled. Also, you will need to leave in at least
a double pal/ntsc monitor driver in addition to the
VGA only patch in order to use a VGA type monitor without
a scandoubler, unless of course you use the multiscan
or euro72 drivers.
With scandoublers you can still use the super72
and double pal/ntsc drivers along with the VGA only
patch, it should just pass through. The VGA only patch
will still only bump the scan rate up to about 29khz
or so with the double pal/ntsc drivers, but most VGA-type
monitors can handle this.
With some system friendly games you can try using no
scandoubler, a double pal/ntsc driver, VGA only patch
and enable mode promotion. It attempts to promote the
display to a VGA-esque display, but is a bit flaky, at
least in my experience.
I would recommend leaving the scandoubler hooked up; the
video modes that aren't around the 15khz range will
just be passed through.