Automatic, SMG, Tiptronic, etal = no clutch pedal.
I guess you are talking about shifting gears in a manual transmission. I used to do it with my motorcycles and timing is critical. One bad timed shifting = chipped gear tooth.
But why would you wanna shift gears in a manual tranny car without using the clutch? I mean, it only takes a nano-second to press-let go of clutch. Like I said, one mis-timed clutchless shift, is already bad. Imagine having several of those.