For the gradient. No unfortunately a gradient is not the best way to "draw" a shape, but cause you have 0 control over the interpolation. So if you have two keys only you get sort of a plateu spline interpolation, but if you have 4 like in your image this is what looks like:
While you can have a curve that does the same you can't have a gradient doing the same as a curve, especially if you don't have handle controls per key or parameters like TCB.
Well indeed i could use a technique I found out with the help of pooby, of generating 2 big sample arrays, on the input array, the other the solution array, so basically a lookup table where you find the closest value in the input array and return the value with the same index in the solution array. But that requires you to compromise precision, plus this was for code, so I wasn't interested in have 2 huge lists in python to do that, plus the list values are fixed. So, bahhh
Anyways I do wish for a more "drawing" ability to control the falloff. IF this was only a modeling tool I would have slapped the profile curve without a problem.
Thanks for the kind remarks man
Always welcome, especially when one is looking for a job 
Thanks for the discussion and sorry for the very late reply.
