you have to be the server owner to change it.
you send a redstone signal to it
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When creating a world, you have the option to enable cheats. (e.g /gamemode 1) This option is disabled by default. To enable it, simply press the button.
enable cheats then go into chat and type this up /give @e barrier.
You just mod your minecraft.jar like you normally would.
Escape - open to LAN (check enable cheats) - do /gamemode 1
Yes, but the way to activate it is to enable cheats and do /gamemode 3. It is very buggy, though.
You can search different sites that display server information like;Server typeRules
There's no official friends list in Minecraft, but you on special servers there are plugins that enable you to add friends.
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There are single player mods that enable this as a command. But most are for multiplayer if you are searching the plugin: WorldEdit is the most chosen