Standard shortcut for expand all / collapse all

Member Chooser uses different shortcuts than the standard ones, is this intentional?

StructureViewComponent adds also Expand All / Collapse All but without shortcuts, are these two buttons in the toolbar really necessary, space is always limited and the buttons are already placed in the title?

/com/intellij/ide/structureView/newStructureView/StructureViewComponent.java:451

DomModelTreeView adds also Expand All / Collapse All without registering shortcuts, but it seams that getPopupActions isn't used anywhere.
/com/intellij/util/xml/tree/DomModelTreeView.java:178