Document how it works, how it can be configured and tweaked.
Building Syncope from "syncope/branches/1_0_X" a self registration link appear on login form.
The issue it's assigned only to 1.1.0. Correct?
Self-registration is a feature already part of 1.0.0.
This is issue's purpose (read from description above, please) is to "Document how it works, how it can be configured and tweaked.", i.e. the expected output is a wiki page.
you are right, I just red the title, sorry. If you give me same related information where to look at in the source code (or a commit about this feature) I can work on it.
I'd suggest first to take a ride of the self-registration feature by starting in embedded mode.
You can take a look at the UserRequestController  to have a deeper idea of the whole process.
I have created an initial version of the self registration page  on the wiki.
I can still improve Opt-in description:
1) Customization of token: lenght and expriration time
2) How token validation occurs
 - https://cwiki.apache.org/confluence/display/SYNCOPE/Self+registration
I've made some rework around your original page and split in two different pages for user requests (including self-registration)  and user approval .
Bulk close for 1.1.0