WISH: detail views to be any shape not only rectangle

detail view could be any curve, not strictly rectangle.

sometimes i need to cut out certain parts and its not very possible with rectangle.

Yep, I added your request to the list at
https://mcneel.myjetbrains.com/youtrack/issue/RH-2574

I do hope to be able to tackle this during Rhino 8 development, but I need to make sure we have some pieces in place on the Mac first