I have recently had to create an intersection which had some multi curved kerb returns, the interestion design tool struggled to follow the curves correctly so I had to use featurelines instead to create the intersection. I found the kerb returns were limited by certain parameters and didn't have the option to override by selecting a target. There are other elements within the intersection design tool which allows selection of an alignment or featureline as a target, similarly within corridor creation.
Could the kerb returns have the option.