And I was wrong anyway. I tried to change the resource.cfg file myself on my copy and it just errors out. The files needed for MCGA aren't present in this version. I did try and manually copy them over from a standard Silpheed release but no dice. However, one VERY interesting aspect of this is that there is a newer Adlib.driver and this driver actually appears in the installer as Sound Blaster/Pro/16 Stereo FM. Or at least I just noticed that for the first time and it does work in OPL3 mode. So then what did I do next? yeap...I moved that driver to several other Sierra games. These are the games that the newer adlib driver works with and works well:
KQ1 SCI
Hero's Quest
SQ3
Colonel's Bequest
Conquests of Camelot
Codename: ICEMAN
PQ2
Games it didn't work on:
Quest for Glory 2
KQ4
KQ5 VGA - Intro is silent and skips scenes but in game music there after works
KQ5 EGA - Locks up

Midi Modules: MT-32 (OLD), MT-200, MT-300, MT-90S, MT-90U, SD-20