This work item was recently done for v2.7: "Add to cart" button on the wishlist page should move (do not copy) items to the shopping cart
To move items form whishlist to cart makes sense. But in case of a b2b or grocery stores the wishlist can be transformed into a shopping-list where the customer adds all items that he shops regularly, thus saving a lot of time/effort searching for items every time.
Therefore I suggest that the store owner should have the option to decide whether items from whislist should be copied or moved to cart. Whn used as a shoopping-list (copy option) it is also useful to have the option tu sellect/deselect all the lines in the "Add to cart " column.