I’d like to request that a “Duplicate Layout” (or “Copy Layout”) command be added to the contextual menu when right-clicking a layout, in order to create a copy of an existing layout as it is at that point in time. This would be super useful in cases where you might want to create an arrangement of an existing piece, keeping both versions in the same file, sharing the same musical data. For example, a cello version of a violin piece (à la Stravinsky: Suite Italienne), or a viola version of a clarinet piece (à la Brahms: Op. 120), etc… (It could probably also be helpful for 101 other reasons, including quickly creating a starting point for a variation of an instrumental part for the purposes of cross-comparison before making decisions on the final layout for that part.)
Currently, to duplicate an existing layout, it seems you need to create a new Layout (such as a new Full score), and modify its settings to match those of the one you are duplicating, swapping out Players as necessary, and re-formatting its engraved score with any manual adjustments and page breaks that were added to the first one. This can be quite time-consuming, unnecessarily duplicating work already done.
Being able to have multiple Layouts for a score in the same file is such a wonderful feature of Dorico (idem for having multiple Flows, as I am discovering) – how did we live without this before!!! Being able to duplicate an existing Layout would be oh-so-helpful!