Ivgalvez,

About the key definition:
The key def submenu has it save button in the left upper corner. You are using that button? Maybe it is a bit confusing to have a separate save button, I may go back to one savebutton, but code technically it was most easy at the time.

About cps2emu:
I am actually working on cps2emu, to counter the mute issue I am experiencing, and reimplementing the keyconfig. The latter is because I do not have the source code of that addition, and I want to add some more configurable options. Perhaps I can look at your issue with the spanish keyboard also.
Unfortunately things do not turn out to be as easy as I hoped, so it may take a while if ever fixed