Do the following:
g "powexectoggleoff Dark Nova$$powexectoggleoff Black Dwarf$$bind lshift+lbutton powexecname shadow step
b "powexectoggleoff Dark Nova$$powexectoggleon Black Dwarf$$bind lshift+lbutton powexecname black dwarf step
Edit the keybind file and make these changes, it's not working in human form bc you need to rebind it everytime you leave dwarf form.