Why SP mode? to avoid the lemons and pvp'ing? I plan on playing private group so I can coop with some pals from time to time.I'm playing with a 360 pad and think its not all that bad. A proper flight stick may be better, but you'll get away with a pad.
I played the original Elite on my Beeb and Amiga with a simple joystick and the keyboard. I'm for the most part intending to play Elite : Dangerous single player, so I don't think It'll be at all that much of a disadvantage with the 360 pad.
More than welcome to join up if you wish the same sort of gameplay. As long as you start a private group char, the way I understand it, you have the choice to play alone or with like minded folks when you choose to.