It's only possible for modder right? There's no easy way?Yes, this is possible, this is just a common modding.
For example, the modder just put a mod menu ONLY for God mode switch on/off, no other option, by editing inside apk file and by hooking.
And the modder also edited the same apk-boolean and string by using dnSpy or ida pro for unlimited gold without using the mod menu.
For the modder or anybody else who knows how to mod it.It's only possible for modder right? There's no easy way?
Roger that thenFor the modder or anybody else who knows how to mod it.
The easiest way would be having lucky patcher in the rooted device and alternate both mods by installing the one that you mostly need.
You could also try learning and mod it yourself with the features you want.