Few months ago I finished a new LSL system called Prim to PHP, which lets me setup systems for user authentication for accounts in database with just touching a prim vs having to register accounts the system also allows for paying for user accounts with linden's vs say $ for pro accounts. This system is work in progress I got the core already coded and made but it's something I'll be looking into for

AQ Connect and related systems. Password are auto generated, hashed and salted when an avatar touch's a prim, and they can change the password touching another prim and or complete wipe all trice of the account by touching another prim. As well as check status and other. The system has its own API so I can setup for content creators wanting similar system later.

It also makes it possible to make authentication for nomod/transfer/copy items that require authentication. Example demo clothing in SL for a brand, if the user isn't registered they can only wear the demo so long etc. Other fun uses.