Calculated metrics builder: Add 'Ctrl + Drag' to copy

[#1]

Being able to hold ctrl and 'drag' to copy an element is a really useful time saving feature that works almost everywhere except the calculated metrics builder.

This is particularly bizarre given ctrl + drag does work in the very similar segment builder

It would be very useful if the calculated metrics builder was in line with other areas - please can you consider this?

[#2]

fully agree! thanks for adding the idea!