By golly it works! Some interesting observations!
I did most of my testing with Space Quest IV, which is a game that I don't believe ever officially supported WSS (at least my copy didn't come with a driver). Using the new 16 bit driver it works pretty much flawlessly. My biggest complaint is that some of the sound effects (the HUD noises in the intro over the planet Xenon for example) are too loud, but I think that is problem with the games sound design, not the driver. Using external midi with line-in everything plays properly in stereo. The audio samples them self (like voices) are all 11khz or maybe 22khz mono, but it plays out of both speakers now which is huge. My new favorite way to play this game now!
I have a VIA C3 Nehemiah processor, which is really good at approximating a 386 as well as fast 486s up through Pentium 3 speeds. Running the game at approximately the speed of a 486DX4@100mhz I didn't notice any errors. Cracking up to max speed to what is roughly similar to a P3 @600mhz I noticed that the pitch was off for some midi notes but the WSS side of things had no issues. I think the optimal speed to play this game (and most sierra games from that era really) is a 386DX33 speeds. Something else to note, sierra games are known to have issues with XMS, and the driver has no problem running without it.
Using the WSS mixer setting instead of the SB mixer settings, I do think the mixer settings are actually being used now. It is not as loud as it was before. Unfortunately, with WSS, all audio will play too fast even at 386DX33 speed settings. Running at full speed the sound might play even faster, although it is hard to tell. SB mixer settings don't have this issue. For me this isn't much of a problem.
I also tried King's Quest VI, which with the old driver would just squeal very uncomfortably (AKA ear rape) whenever samples were played. This driver works flawlessly with what played. No issues!
After checking again I realized I forgot to update the driver properly. This one still has issues with WSS.
Space Quest V, likewise, running great and sounding great too.
Police Quest 1 Remake working with 16 bit driver as well. Never officially supported. There are likely more!
King's Quest V would load the 16 bit WSS driver but would just skip all sound effects. It never officially supported WSS, although maybe it could be made to work with a game specific patch.
I don't know of any other fully voiced games sierra that are 16 bit compatible. There are probably more unvoiced 16 bit games that would work.
I mentioned earlier that LSL6 is compatible with the 16 bit driver and I was mistaken about that... it requires the 32 bit driver. The majority of WSS compatibility seirra games require the 32 bit driver. This includes LSLS7, Gabriel Knight 1 and 2, Phantasmagoria, and many others.
In a similar vein, there are other games that seem to use a common sndsys.com driver - Like 7th guest, Return to Zork, Lode Runner the Legend Returns, and likely others. A modified version of this driver may bring WSS compatibility to these titles as well.