I too would love this feature to be implemented. For illustration, precise control over variable stroke width is a must.
In the meantime I can appreciate the pressure tab workaround, but for larger lines or illustrations this isn't really viable.
One possible idea would be to have a visual indicator visible along a path to edit a width profile. These changes
could be made then updated in the profile window also. As mentioned earlier in the thread, abrupt changes in the width could be mitigated by adding anchors to the profile points, and along this path indicator. One problem with Adobe's Illustrator
implementation is the sometimes unpredictable behaviour of stroke width that occurs at tight corners on a path. Perhaps
adding a parametric option to the pressure/width profile editor would eliminate this problem.
Looking forward to how this goes! Buying my windows license this week :3