One think I do like (as I like to tweak stuff) about Audy and Dirac, is that you can customize the target curve in any which way I want, no matter how crazy/stupid it looks (I have my own theory on that

).
So, in addition to picking a target curve, is it possible for you to allow the user to customize the selected target curve post calibration, such as allowing the user to manipulate the curve in a select range (again, similar to Mult EQ X, or Dirac's), or simply allow the user to pick selected frequency points, such as when REW show a bump at 50 Hz, to input the desired cut in dB (or even boost in that case need to have a limit) and a "Q" , that is, similar to using PEQ. If that's too much to ask, okay, thank you for considering it regardless.