Hi. I've tried getting in touch with some plugin developers I know of privately, however have unfortunately been unable to find anybody.
I'm currently on the lookout for a developer who would be willing to build a private addon for our site. In essence, we're after an application system to replace the standard user registration system. Users will fill in an application form with their normal user account details, and some additional information, which will then submit an application form to be reviewed by a staff member.
The staff member will then be able to either accept the application, validating the user's account and providing them with access to the site, or reject it putting their account into a disabled state.
Let me know if you'd be willing to take this on, and we'll be able to exchange further details.