Behavior of "Go drivebuttons=multifunctabs"

(This is not a new behavior of Opus 10).

I just discovered that in a dual display lister, Go drivebuttons affects the source lister, but GO drivebuttons=multifunctabs always affects the top or left lister. Is this intended?

multifunc means left button = open in left, right button = open in right.

(Gulp) I see.