I used a plugin for the extra buttons, but I dont's own MZ,
while it should work, I dont know if there is any keyMapper plugin
made for MZ, or try to request a port or to be made in order to use it.
I cannot help you directly, while MV and MZ are mostly the same
different, and I didn't made that plugin.
I'm sorry for the if it didn't work for you, but you can exclude the
Jump and Spin for the time being and see if that works for you,
if it does, see if someone have or can make a keyMapper for you.
Good luck on your project.