Wojciech, if you want to use this feature for, say, 10-30 + people, I suggest creating a process for it in WEBCON and a job in SQL that runs in the service window at night, e.g., from 10 p.m. to 4 a.m. In the process, you add reporting for who it was performed for, along with a notification of completion to the person concerned. After making all user changes, it is a good idea to reindex SOLR after changing logins.
I processed this for 1,500 people, but it took a month, and the list of people was indicated who was to have their logins updated on a given day.
As Daniel wrote, you can write to webcon support or to the implementation company that will provide you with this.