Import 1000+ names as "site members" to new page

Ok, i think i have to study this process a little bit more, but just to be clear.

Some facts:

  1. You can’t import Users-Data directly (csv-file) into the “PrivateMembersData”, right?
  2. When you export Data from “PrivateMembersData” the export do not include “passwords” right?
  3. When using his own database as “PrivateMembersData”-replacement", it is not possible to store passwords in a secure way, because there is no option given to declare a reference (column) as a crypted/secured password-field, right?