While the Contact Permissions Plugin is very useful and offers lots of functionality, setting it up has inspired me to think of a large number of possible enhancements.
https://community.tessituranetwork.com/ideas/i/ideas/new-contact-permissions-plugin-idea
Note that another Contact Permissions Plugin enhancement Idea already exists:
https://community.tessituranetwork.com/ideas/i/ideas/contact-permissions-on-tnew-should-require-preferences-to-be-set-at-account-creation-and-persist-last-preference-even-if-last-ask-date-is-expired