There has been a request for this feature, but this request has yet to be answered. As this is a feature that is a common request, it would seem that the structure of plugins and mods does not allow this.
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You can sometimes turn options on and off in a mod but the only way usually to turn the whole mod off is to un-install it.
not if you download it off the minecraft site. you can get mods for it but they can be a virus if its fake, but the chance of that is slim, and theres no chance that you can get a virus off a mod on the minecraft mods website.
Press T and type /fly in mutiplayer. Note that this will only work if you are a mod and there is a flying mod installed. In single player, double press space to fly. Press shift to descend and space to go higher.
You can only turn off the rain if cheats are enabled. If they are, the command is /toggledownfall
turn off the firewall is all you can do.