My take:
Carnauba waxes will have solvents to keep the wax easily spreadable. Thus, any gloss enhancement agents in the QD should not affect the wax (not to mention that waxes don't really bond, just cure). To be on the safe side, you could use the S&W.
I like a little QD (FD, Sonus, or QS) before waxing because it makes application and removal seem easier due to increased slickness. Not sure if durability is harmed because I don't really have the patience to find out.
Sealants are a different story--I wouldn't lay down UPP or Z after your Last Touch given the bonding issues.