Rhino has this great functionality that allows a tap of the Alt key to toggle any command that has a Copy option. When Copy is on, you get a plus symbol near the cursor. It works on Gumball, Rotate, Mirror, ExtractSubCrv, etc.
Unfortunately when using it on ExtractSrf in Rhino 5 it doesn’t work. And it’s still broken in v6.
Can we please have it working in v6?