I just tried the WordPress integration plugin (LimePress) and got a number of SQL errors. From reading this forum, it seems that this plugin is no longer compatible with the newest version of LimeSurvey.
Has anyone being able to modify this plugin to work with current version version of LimeSurvey? Or can anyone provide the necessary steps to programmatically add a new user into the LimeSurvey database. This plug in seems to be using direct SQL statements and not the LimeSurvey API.
Perhaps the right way is using the API. If you want to try the programmatic way you can take a look at method adduser() in application/controllers/admin/useraction.php