Firstly, wonderful plugin. I simply couldn’t live without it.
Ive seen the request for the ability to clone/reuse fields across several layouts. For example, I have a flexible field allowing my client to choose the contents of a container. Each type of layout has unique fields, but also features that are the same across all the layouts. eg. Defining the margins for the container.
Interface wise, you could add a new field type called ‘Clone’ ( for example ), which has a single parameter asking for any existing field group name. This group would then be inserted into the layout. So, in my case, I would create a ‘margins’ group which I would then inject into each layout using the new ‘clone’ type.