Cant see a "Release Spirit" Button? The following will teleport your spirit to the graveyard.
/run RepopMe()
Stuck inside a vehicle without an exit arrow? The following command will eject you from any vehicle you are currently in.
/script VehicleExit();
Dont see an "Accept" button after someone gives you a rez? The following command will accept the last rez if the timeout hasnt expired.
/script AcceptResurrect()
Since there's no option to eject passengers from a sandstone drake (and possibly the obsidian nightwing mount) here's a script to do so
/run EjectPassengerFromSeat(1)