3D Mirror, possible?

 From:  Dee3 (DMATHO)
160.1 
Hi Michael
I was wondering if it would be possible to add a 3D-Mirror option in order to create a copy of an object using a plane or any 3-points in space?

The attached shows the current process, following a two step-process. Starting from the lower-left to the bottom right, first create a mirrored copy and then, on the top-right, another copy via rotate-by-axis. I believe a 3D-Mirror would cut down on the steps, unless there's something already there I don't know about.

Cheers,

- Diego -
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