Yes you can use a joystick on the PC. When you start Fallout New Vegas with a joystick connected (or connect when game running) it will recognize the joystick and use it as the only input device (yeah, the game designers made it so the keyboard/ mouse is disabled, which sucks).
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Yes but it´s a bit sensitive.
Yes probably. but i don't think will be able to play as effectively. hope this helps
yes and its to look up and down and side to side or you go on the setting and go on controland it tells you...
you move the joystick to move your character, or in some games, aim
No, from what I know the Roblox team has never said anything about the ability of using Joysticks.