Hi @Trash,
Restricted user accounts are planned, but the specification hasn't been completed yet. There's some infrastructure work that needs to be finished before this feature can be added (user roles, corresponding permissions, how to operate in mixed authentication systems for restricted accounts, etc.).
After the spec is finalized it would take at least one monthly release to complete this feature.
Could you share more about your use case? Perhaps there are alternatives to consider, or perhaps the feature could be reduced in scope to achieve what's needed.