Another option to using a pedal stop is to modify the pedal arm so that the pedal pad rests closer to the floor. This reduces clutch pedal travel but also makes the clutch easier to modulate.
I designed on of these pedals for my own BMW 325i Wagon in 2002 and used to sell them for other BMW's in a prior life. But the same principal will work on any car with a clutch pedal.
http://www.bimmerworld.com/BMW-Inter...Series-07.html