Are there any special considerations involved in designing manual flight controls for supersonic/hypersonic aircraft?
In the transonic region, control forces may become too high for manual control (e.g. controls froze in WW2 planes diving at high speeds), so supersonic aircraft usually have powered controls rather than manual, cable-operated controls.

You also get CoG shift you have to compensate for. This is often done via a Mach trim system or by automatic fuel transfer.