The switch is used to 'point' SH3Cmdr to a different install location. However, GWX & NYGM have separate & different files which need to be added to SH3Cmdr's program folder.
My suggestion is to have 2 installs of SH3Cmdr and rename them to SH3GWX & SH3NYGM. You may be best using a re-installation of SH3Cmdr to ensure no crossover of files. Once you have 2 standard installs of SH3Cmdr then add the mod specific cfg files to each relative program folder, then create shortcuts on your decktop for both versions of SH3Cmdr.
Don't forget to rollback SH3Cmdr.
GWX Cmdr files can be found by clicking on my sig.
NYGM files can be found after extracting the d/l of (IIRC) v2.2 (note NYGM is now at v2.4 you can find this in the MODS section of Subsim)
__________________
|