Album Detail View: For works spanning multiple discs using right click on the work just selects the grouped items of the currently visible disc (in the current disc tab). I think it should select all items - including those on other disc tabs which are currently shown. As things are assigning tags or editing all items of a grouped performance spanning multiple discs is not possible to achieve in one (1) go from the album detail page.
An alternative would be to have a switch like “show disc grouping: yes / no” but that would currently conflict with another limitation of Roon (large boxsets could reach the limit of displayable tracks).