Hi Claudio,
You can force the portlet to be added on the right side using the parameter "lorsm_portlet_force_region" of the lorsm-portlet package. A value of "1" means left, "2" right.
On the side, the lorsm portlet will be added to the user portal when the user is enrolled in a course that uses it. So a new user that hasn't enrolled in any course yet, won't have that portlet installed.
I don't think it's safe to insert a row in the portal_element_map table.