Currently the "Subflow" options for "Create Subflow" and "Selection to Subflow" are nested in the top-right menu. I often find myself selecting nodes and then right-clicking to move them to a subflow, but alas, this option isn't present.

Instead, I need to highlight the nodes, then select the top-right menu and navigate to the "Subflow" submenu.

This would be most appropriate for "Selection to Subflow", and arguably, is the only relevant option here to add to a right-click menu, as "Create Subflow" wouldn't have too much value.