Not only can you use Omega drivers on laptops, you can use Mobility Modder to fix the normal Catalyst driver so you can install it. You can find it at http://www.driverheaven.net/patje/
Be warned that KOTOR 2 is not designed for laptops or older desktop video cards, and you might not have much luck getting it to run.
KOTOR 2 requires hardware OpenGL 1.3 support on nVidia cards and 1.4 on ATI cards. This is not the version number of your driver, but the functions designed into the chip.