There are some tools written in PHP that directly connects to Database to edit Server Values...
These tools don't rely on DOL Assemblies (DOL.GS...) so they have to mimic the data expected by DOL to display forms accordingly and will rely on copies of constants (some time even logic) from C# source to work properly.
Editing the database directly should be used when server is offline, there are some Admins command that allow to refresh data from database but you can run into unexpected behaviors (and not all server features have refresh methods implemented)
I made some research to host a web server directly inside DOL Server Runtime and provide HTML forms compiled in C# that can change values immediately in Game Server (all assemblies are available for building forms), but this is completely experimental and I only made a Server Properties Editor for Proof of Concept