Not exactly, bondjetta.
Bitg, this is run on the two RPG forums I initially cobbled it together for. And as such lets a dozen or so people switch between their various accounts.
With the hack as it is at the moment the admin will have to define the slave accounts on the main user's profile (from the ACP). In v1.2 this selection will be easier still, not requiring to enter the UserID number.
As for allowing users to string together their various accounts themselves: this I listed as 'future non-options (things I'm likely not to implement)'.
So while it works for several accounts to have slave accounts perfectly, the admin will have to set these up.
And I know I can create a user-mode, with a validation procedure a user can go through to prove the 2ndary account is theirs as well. I have so far chosen not to implement this, is all.
Being involved in RPG forums I know it's not much of a trouble for an admin to string accounts together like this, plus it'll let you keep tabs on users as well.
If it's ever going to be implemented this will be v1.3 or after. First I mean to have less of a performance overhead, the new admin interface, and the option to show the 2ndary accounts on one's profile.