Regarding the pitch control - sorry, you're asking for relative pitch function, which is not available in rekordbox. Instead, rekordbox uses a hardware pick-up function. You need to move the position of the hardware to the "soft" position of the pitch fader to pick it up in order to change the value. This prevents a jump, but also allows for use with multiple decks.
If you're using multiple decks for the SR, then you would have the need to flick the gain, as that would "pick up" the knob position from where it was left from the other deck... again, this is a software pick-up function, and is perfectly normal. If you only ever used 2 decks, chances are this wouldn't be an issue.