thanks for the info,
just posting back to inform that i've got it sorted with the good old Windows application PowerStrip.
in my case at least, GeForce 440MX with Forceware 93.71 (winXP) does support up to 1920x1080px (i.e. the native of the 22" LCD) and pretty much any user defined resolution, being 4:3, 16:9 or other.
some info on PowerStrip here: