Don't think there is a out of the box way of doing this.

Depending on how your CSV file is structured I would either import it directly to the database (this works if you have the same strukture as the tables) take a backup before doing this. Else I would do a code snippet for reading the file and creating the uesers.

I am facing the same problem here, need to create 100+ users.

It would be nice having some bulk feature given a list of names and output users. 

I dont think our 3rd party developers will do this as its probably outside of the scope of the agreed work. My background is in the infrastructure of running/hosting installations & zero experiance in episerver development. From what I can tell its using aspnet roles/users to store the users but I wouldnt want to start adding stuff directly to the tables. I did look around on the add-on store but nothing in there for user management.