Imported users form jabberd2 without roster data

How to change roster status for all users at once, so they dont have to request authorisation for all contacts. . .

If you are looking to have a prepopulated roster you need to create a group add the users to the group, then share the group. This doc will help with group sharing:

If you are talking about eliminating the nags to allow roster additions, you need to install the subscription plugin, and configure it to allow local.