Trace to selection

A Bit of background here.

When we want to trace a object located in a picture/image, we need to crop to needed area then Trace that precise area but... known the current tracing tool yet need to be improved and that sure as gradient colors cames out in worst conditions ...

I'd propose a sort of Trace to selection, let's say I have a picture/image with many or one object that I want to trace, it would be nice if I can select the related area (or areas if multipoint selection) then click on the Trace button to get the result in vetcor.

Still proposing it should propose me if I want to keep or delete original.

Much Blessings