yes, S1 can accept an independent shifter for steering wheels,
just enable "Accessory Support" in "Settings" of our APP.
your shifter will be recognized as a joystick,
and mapping it to G29's shifter in our APP will make it work.
as for analog handbrake, what kind of handbrake is it?
can we have more details on it?
btw, it shall be supported by the game first,
most of the racing games use e-brake.