Can't rebind buttons on a fightstick

[Bors_137]

So I play a lot of fighting games and for the lols I thought about trying to play wicked on a fightstick and overall I’m pleased with the results. The problem is that I would like to remap the buttons and I’m not able to because it says that I have to remap all of them to be able to save the changes but there’s not enough buttons to fill out the remaining empty option so I’m stuck with the default binds. I would love for it to let me to save the changes while leaving an unbind, or at least let me map the remaining one to the keyboard so I can save the changes. Thank you!