Shell thickness

[lsmliborio]

Hello, first, I'd like to thank you for the amazing software, my 3Dprinting experience improved a lot when I changed the soft.

But now, I sometimes work with pieces that contains a hole for screwing, and it should be strong, the simple solution is raise the shell thickness, but, most of the time it isn't necessary to do on the outline perimeter shell of the piece, I need it the less material, better, only exception in the hole. It would be very nice if Simplify3D had a feature that controls the thickness of each shell.

Thanks!