Unified user/subscriber database for multiple plugins

Hello Jack,
This is a continuation to #post-659876 , as it was closed for reply, I opened a new one.

You wrote: "The plugins in question can all use and would use by default the same user database" (referring to: Social Marketing, Floating Social, Pay with a Like, Affiliates, Automessage, Fundraising, Pay Per View)

However, my question was not referring to the database itself, rather to be able to see a unified user repository, as I can see for example with the WP users.
So in other words, I'd also like to be able to see all the users generated by the plugins, If you take the fundraising as an example, i'd like to see a donating users appear in the word press database also.
Is this the case, or can be done?
Thanks