From what ive seen as long as no other brotherhood of steel guys are around they won't turn hostile. if there are, it will only be those guys, not the whole brotherhood. (so yes, you can kill them, take their holotags, and then sell them, pretending that you simply found the person dead... lol.)
If you feel like killing Arcade Gannon. He isn't able to be your companion after the quest so killing him wont effect anything or make anyone hostile.
no
You don't. It does not exist in fallout 3 without the use of the console and mods. ( Only for P.C )
Joystick for Fallout 3?No, Fallout 3 is set up for use with keyboard and mouse on a PC.or you can have it on a console without a keyboard which is better known as a controller
No!
Megaton is in Fallout 3. Point Lookout is one of Fallout 3's DLC packs. You can visit Megaton without having Point Lookout, it is part of the vanilla game.
You can't, it is a Steamworks title.
Sleep
They influence of the brotherhood was... People could now say what they wanted without being prosecuted. They could form groups of people.
No it cant you have to have the CD to play it.
Fallout 3 is not a browser game, so on a PC you need to download and install it. On a console it obviously does not need to be installed.
Yes, the animes are considered separate, and there is no information that you would need to know from the original to understand brotherhood.