I run the number pad minus for human, plus for nova and enter for dwarf with corresponding tray shifts.
As follows:
Human :
/bind SUBTRACT "powexec_toggleoff Bright Nova$$powexec_toggle_off white dwarf$$goto_tray 1"
The number pad plus is ADD and the enter key is (easy enough) NUMPADENTER.
Thought I'd add this in as I had to really dig for this info and it makes my life much easie. I also have a bind to shift to human with energy flight on for those travel moments.