Have you read through available documentation, open Github issues and Github Ideas Discussions?

Yes

Describe your request:

What new feature would you like to see implemented in MooseFS?

It would be really interesting/useful to have an explicit setting to control the default mfsmaster hostname for mfsgui (and honestly it'd be nice to disable the ability to connect to an arbitrary different one via query parameter, but that's not as important to me).

Why this feature? Is it a necessity or a nice to have? Is this feature related to any other features or problems in the open issues?

Every other service allows setting MASTER_HOST in their configuration files with the notable exception of mfsgui (and mfscgiserv before that, but it wasn't sharing configuration file parsing code so was more understandable IMO).

As a workaround, I've found that the default values live in /usr/local/share/mfscgi/common/constants_ac.py and I've modified that file manually to change them (because I don't run my master at the default mfsmaster hostname), but it'd be handy to have an explicit configuration option for it instead so the distro-provided files can stay unmodified. 😄 ❤️