If you have an older non widescreen monitor or if you can get one used try playing the games on that. There will be no stretching and images will show properly without appearing to be ridiculously zoomed in on the main character/party.
That shouldn't need an old 4:3 monitor. I'm playing all my old 4:3 games (Windows and DOS(Box)) fine on various 16:9 and 16:10 screens, with the 4:3 aspect ratio. I get the black bars on the sides.
Alternatively there are high res mods you can use for the infinity engine games. There's a guide right here on gog to help you http://www.gog.com/news/mod_spotlight_planescape_torment_mods_guide
Hmm, since he was talking about "Forgotten Realms games", I presumed he was referring to the "Forgotten Realms Archives" games (Goldbox games, Eye of the Beholder 1-3 etc.), not the newer Infinity engine RPGs (even if they have Forgotten Realms setting too)? Those FRA games probably run in DOSBox, so DOSBox config settings should be changed to try to get the correct aspect ratio, and any extra filtering one might want.