Re: 3), here's a clean and technically humble way that I typically use.

    enum {
        KEY_FOO,
        KEY_BAR,
        KEY_BLAH,
        NUM_KEYS,
    };

    struct KeyInfo {
        const char *name;
        int info1;
        float info2;
    };

    const static struct KeyInfo keyInfo[NUM_KEYS] = {
    #define MAKE(x, y, z) [x] = { #x, y, z }
        MAKE( KEY_FOO,   1,   1.0 ),
        MAKE( KEY_BAR,   7,   3.5 ),
        MAKE( KEY_BLAH, 42, 127.2 ),
    #undef MAKE
    };

    void print_key(int key)
    {
        printf("%d's name is %s\n", key, keyInfo[key].name);
    }

It's both low-tech and maintainable. It compiles super quick. If one doesn't like that one has to type KEY_FOO twice (in the enum and in the array definition), one can use X-macros or code generation. But personally I don't care.