Create a new project, go directly to PCB, and add a footprint, then add an SMD pad with custom shape. Manually enter shape such as (m 0 0 h 1 v 1 h -1 v -1 z); this yields a 1000mm x 1000mm square as expected. Then add a scale rule with value of '1'; this also yields a 1000mm x 1000mm square as expected. However, if the scale is set to 0.1, the result is a 10mm x 10mm square. If scale is 0.5, the result is a 250mm x 250mm square. It seems like the applied scale is actually "Scale^2". This seems to also happen for a Pad created in a Layout container. I've successfully used this for a board outlines in the past where I used a scale of 0.001 to convert m --> mm, but doesn't seem to work for a Pad object.