If I understood the above correctly I can only wholeheartedly say that I would like to have such an option as well.
I would like to have my left side-bar show the child-pages of the parent-page I am now browsing. In the header I already have the regular parent-content list.
For instance:
– A
— A1
— A2
— A21
— A22
— A3
—A31
– B
— B1
— B2
– C
— C1
— C2
When I am on any A-page, I would like to be shown A1-5 on my sidebar (not A21,A22,A23). On the B- and C-page the same applies. Even though I am on a child-page, I would like the entire list of content of that specific parent-page.
Is this already doable, because I cannot get it to work with the ‘Current Item’-variable in the widget-menu.. Or could it be included in the near-future?
Cheers!