I think Carmageddon might play alright, but I've never tried it myself.
I have, it is fine though I don't think I tried Carmageddon 2.If I recall Falcon 4 plays okish on a Lombard... dunno about a WS/PDQ.
btw, I have noticed that my PDQ does not like displaying 640x480 and 800x600 fullscreen so things like StarCraft are stuck with a huge black border.
Also, Driver on my PDQ just crashes or locks up or something with a black screen if I recall but runs ok on my Lombard so I don't know if that is software or tied to the hardware of my PDQ.
*Edit
what about things like Oni, DogfightCity, Hexen 2, Valkyrie, mechwarrior 2, Tomb Raider III, chuck yeagers air combat, Descent II, Wolf 3D, Marathon trilogy?
I know Oni works on my Lombard but it had been so long since I used my 300Mhz/384MB RAM/40GB HD containing PDQ for any OS 9 gaming so I can't really remember.
Bunch more games that I cannot recall atm as well.