Modded =/= gold. Every server can change the configurations. Based on what you said, it's an attack-defense server with zombie skins on builders.
Custom game-modes are NOT gold only, I don't know where you read that (I can make a custom game-mode where everyone have bison sprites and are builders incapable of build, but that doesn't need to be gold only).
Yes. 1: The poster in the GUI folder that shows Full and Free Version features. It shows that CTF, Sandbox and Deathmatch are free only, while Custom gamemodes and modes like Zombie Fortress and War are full version only.
2: Geti's post says stuff like this is ok for now and later on it will be limited compared to full version. I don't know whether free servers will be allowed to mod/script at all or just change gamemode settings and can't add anything new. I'd rather not argue about this again if you don't mind.
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