Is it already solved?

Actual problem

Again such a simple issue, which is not solved within years and will only get attention, when contacting our accout manager at plesk :/

IMO, this is a very important feature and should be implemented ASAP.
system users should always be automatically prefixed OR suffixed so that they become unique.
The users should be namespaced, otherwise, it gets hard for customers to find something meaningful that's still not occupied by somebody else, they need to poke around and usually become frustrated with usernames being occupied

Consider this:
Our customers will be automatically provisioned and they will get automatically assigned system/ftp user which has the following name convention: admin_{domian_name} (this is a suffix, but it could be a prefix as well). For example, domain1.com get's admin_domain1_com user automatically created. The problem here is that once the domain is created, the customer will be able to create user with any username, so they will be able to eventually crate user with username admin_domain2_com, thus preventing our provisioning system to use admin_domain2_com once domain2.com get's provisioned with us on the same server (essentially stealing the username).

In order for you guys to make unbreakable change, you can implement functionality that will allow for to turn on/off the system user unique prefix/suffix, based on the domain name. This way you can have both the original behavior and the new one, thus you'll be able to support both use cases.

Hey, add it please ASAP, it's a very important feature for all customers!! We need prefix_ before each created by customers username in FTP and MySQL.

can we follow up on this?
where can I change it hardcoded?
we need it quickly and only short-term

Any news on this?

This should be a must as Clients won't battle over the usernames :)

For me, every user should have the prefix "ftp_" so they can be easily distinguished from system users. Additionally, please increase the maximum possible chars for usernames (if not restricted by the OS).