Interesting. The Yanmar kit is a diverter, where you push the button at the top of the stick to change the side to side action from curl to the additional function.
I have two attachments that I use it with: the Yanmar grapple like in your picture, and an angling snow plow. I can‘t imagine wanting to curl and angle the plow at the same time, but curling and opening or closing the grapple simultaneously would sometimes be useful.
I assume they would both essentially go at half speed if you did them at the same time, so efficiency-wise it seems the same as doing the two movements sequentially. Do you find that to be the case?