Kano,
What do you need to do to change your display name on the pool?
You can't set it off - but you can request for me to turn it off if you turned it on, by contacting me in discord,
if you've already given me your discord key (or a new discord key less than 24hrs old)
Setting a value on it, is only an option I'll do for large miners or people who have found lots of blocks over the years.
The value I'll 'offer' won't be a username.
The ones you can see on there are mostly my accounts, so there is no security issue about people hacking into them and stealing BTC since I'll know if anyone tries to use my accounts - and anyone trying to claim they are me, to me, would be pointless

The few that are not my accounts, are also not the account name on the pool.