Discover - Comparison Builder

The Comparison Builder in Discover is limited to a few comparison types:

Difference (B-A)

% Difference (B-A/A)

% Difference Normalized (B-A/A)

It would be great if you could add more comparison types or make it possible to add my own comparison types.

For me "% Difference (A-B/A)" is much more important for me than "% Difference (B-A/A)".

Thanks!

Claudia