The old British cars had fly off handbrakes - unless you pushed a button to engage the pawl at the top of the travel, all you had to do was release it smoothly as your clutch bit for a smooth take off even on a fairly steep hill.
Having a handbrake that locks in place the second you hit maximum travel defeats that sort of easy use and you have to have your finger pushing the release button to accomplish a smooth release. Not that big a deal, but I've never quite understood why they wouldn't use the fly off scheme - owners too stupid to engage the handbrake when setting it, perhaps? (I went to test drive a new Fiero but the GM salesman was unable to find, much less release the hand brake....)
BMW uses a residual pressure release in the brake line - when you have been sitting at an uphill light and release your brakes, it holds the rear brakes on for a fraction of a second which is all you need to pull away smoothly. Simple, elegant solution which probably costs a few bucks, which may be the reason that more manufacturers don't use it.
To address the original question, using clutch slip to smooth high rpm take offs is a rather expensive method. That's why some of the car magazines no longer take times from a stop, but use 5 mph as the point where they floor it. If you just have to be a drag racer type (even though mot sports cars are ill suited to that - straight line acceleration isn't their forte), be prepared to pay the overhaul price of a new clutch, possibly with some frequency.
1957 Jamaican MGA
1958 MGA Twincam
1962 MGA Coupe
1971 Jensen Interceptor
2007 BMW Z4M coupe
2009 Pontiac Solstice GXP Coupe
1965 Jensen CV8
1969 MGC roadster,
1969 Lamborghini Islero S
1988 Pontiac Fiero GT
Bill in BC