Yes. I think all games will do both 15 & 24k and the newest games like the pair of Gauntlets (with the newer video card) will also do 31k.
Some manuals for dedicated Vegas games don't fully list these options. Look at manuals for other Vegas games with similar hardware.
You're probably always fine running anything Vegas at 15k, but supposedly there can be a minor performance hit when running some games at 24k, like War: Final Assault, which is probably why they don't point out that DIP setting in that manual, for example.
I think it's dip bank 2-switch 2 to select between 15k & 24k on most of them.