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The earliest example of DBW throttle in a car that I can recall is in the mid to late '80s BMW 7-Series, with the then new V12. That used two TB's. DBW throttle became much more widespread around 10-15 years ago, although even now I don't think they are ubiquitous.
Creating slack in the cable won't do much other than prevent full throttle opening. It is possible, in principle at least, depending on skill, to play with the throttle linkage. Unlike DBW, you can't have it change with rpm though.
If there is a cam that the cable wraps around, the shape of that determines how far the throttle opens for a given pedal movement. You might find one from another vehicle that can be adapted.
If there is a simple stud connection, that can be moved.
You might also move the pivot point for the pedal.
The cable travel at the throttle and at the pedal still have to match at wide open throttle and you don't want to go over centre.
You will also alter the pedal spring force. Actually, that might work too; use a stiffer spring.
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