Basically, I’d request for there to be a command where the difficulty can be changed on-call for whatever reason. It appears to be in RAM, of course, but it seems that the only way to do this is some manual handiwork. At a glance it doesn’t seem to be a heavy thing to do though I’m not a wizard.
It is a local copy.
FEBuilderGBA packages patches.
This is a similar idea to old rpm etc.
Patch is so small that I never get it from the network.
It is all stored in the FEBuilderGBA archive.
Ideally speaking, it might be better to be able to get it from the network like the package system of linux.
but, I don’t think it is necessary to prepare such a complicated thing now.