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Find an empty parking lot or street, accelerate to ~20MPH in a gear that puts the engine at over 1500RPM, let off the gas, then turn off the ignition. That is what DFCO feels like. Its a good amount of drag compared to coasting in neutral.
I've read that some cars don't do DFCO unless the engine is at 2000RPM or more at the beginning of the deceleration. My '97 Civic seemed like it would do DFCO at any RPM over the DFCO cutoff (which was about 1200RPM, IIRC, then it turns the fuel back on to try to keep it from stalling). I wouldn't use a kill switch in order to P&G this way, but it would help a bit when stopping or controlling downhill speed, especially if your car does have to be at a fairly high RPM to go into DFCO.
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