not sure how a motor mount will fix the light and bland clutch pedal feel? thats almost totally dependent on the clutch master/slave cylinders and the pressure plate. im sure it would improve the vague shifter feel a little though, by reducing motor movement. im going to assume you mean a urethane aftermarket MS3 mount? unless the stock MS3 mount is not rubber like most OEM motor mounts are.
also wont fix the long gears. but i digress.
so does this car have a cable shift linkage? or a mechanical linkage?