Manage custom configuration

Hello everybody,

I'm facing a problem that most of you have already had.

In the cloud (or on premise instances), when I want to update a custom config value, I should deploy a package. This could be annoying when you want to do some tests or make it quickly.

I wondered if some of you have the idea of writing a custom page in order to manage the configuration values ? What could you propose ? 

Many thanks and best regards,

Enes