Use PBKDF2 for all passwords
The Foris password is currently stored as a PBKDF2 salted hash. But the system (root) password is hashed by SHA-512. It can potentially weakens the password security because this hashing algorithm requires much less computational work than PBKDF2 which is recommended to be used for passwords.
PBKDF2 is supported by both LuCI and system libraries (the only tool which doesn't support it is passwd
from Busybox; GNU passwd
supports it). So there is probably no reason to stay with SHA-512.