I got used to playing Doom/Doom 2/Heretic/Hexen, so I use < and > for strafing, moving the spindash key to ; and the normal ringsling key to Alt. Mouse button 1 to shoot, mouse button 2 to jump, if I switch to first person to gun down someone with Tails who just decided to try and snipe me from the air when I started attacking them.
I also have a 6 button 2 joystick 1 hat + L and R button control pad which I rarely use, the first joystick for moving and strafing and the second joystick for aiming and turning, the hat for wearing on your head (Or, in this case, moving and turning as though using a keyboard) and the buttons for jumping, ringslinging, etc, etc. And the L and R buttons for turning the camera. For whatever reason. Clicking the aiming joystick resets the camera and clicking the other joystick jumps.
Otherwise it's exactly the same as SRB2's defaults.