After coming back to SourceSDK is still the issue on how to add with the less code as possible a way to create new gamerules each in seperate file.
This is the only reason why I can't start working on my mod.
After that I'm able to create new files (cpp+h) for a new gamemode, I can work on the mod.
But before that I really need to find a way to have my own gamerules files for each gamemode (one to begin with) and then adding new function to it or ovveriding existing ones.
But realy there is nowhere a good tutorial on this.
I really hope someone with enough experience can put one up for the SourceSDK 2007 one.
Cause the minimal one on the Valve wiki doesn't work for SourceSDK 2007 (mod from scratch)