This definitely would not be high priority but an awesome feature would be the ability to link to internal objects, you could then build up a graph of all these links and show that mind map x references wireframe y and flowchart z etc etc.
A slight variation on this is the idea of ‘master’ objects which you can spawn multiple instances of with overrides (like in sketch)
For example I work for a consultancy and we try to reuse as much as possible, so having one core flowchart for ‘deployment process’ that we can link to from project specific documents would mean that one person could be focused on improving the ‘master’ process and not have to worry about everyone else getting the memo as all other project boards would always be up to date.