Limit profiles for users to create other users with

Our situation is probably a less common one. I'm testing GLPI in our organisation to see if it's a good fit for us.

I haven't seen this option to be available elsewhere, but we would definitely benefit if an option as the following would be implemented.

Our IT Helpdesk mostly helps existing clients, but sometimes an unknown person asks our Helpdesk for help. It would be great if the Helpdesk could create users. I can already give them create users permissions, but if I give them this permission, they are also allowed to create other Helpdesk users, which is something I don't want. I've created a Profile specifically for SSP users and my Helpdesk colleagues get an account with the Helpdesk Profile. I would like to limit helpdesk employees to only be able to create users with the SSP profile.

If this is already possible, I can't find the option.

Edited because there was something wrong in my earlier statement.