[Copy To] {Invert focus}

I find myself often making focus fans on groups of fixtures that are mirrored symmetrically. It would be useful if there was a softkey extension to invert the focus when copying values while creating focus pallets. I would propose it as 2 keys: {Invert Pan} and {Invert Tilt}. It would transform the values between negative and positive around the centre axis (0 °) of the fixture. So, If a referenced fixture is at pan -45 ° then the target fixture would go to pan 45 °. It wouldn't get me to my final positions, but it would sure make the process faster. 

Here's an example: 

Ch 101: Pan 10 ° , Ch 102: Pan 20 ° , Ch 103: Pan 30 °.

[101] [Thru] [103] [Copy To] [106] [Thru] [104] {Invert Pan} [Enter]

Expected Result: Ch 104: Pan -30 ° , Ch 105: Pan -20 ° , Ch 106: Pan -10 °.

Thanks,

Tyler