This is purely a nice to have as it makes it a lot easier to access options from one general map, and error handling of arguments a lot easier. For example, with a map, checking if an option exists would be something like this:

func doA(a string) {
    fmt.Println(a)
}

func doB(b string) {
    fmt.Println(b)
}	
	
func main() {
	m := map[string]interface{}{
		"a": doA,
		"b": doB,
	}
	
	if val, ok := m[as.Args[1]]; ok {
            val.(func(string))("henlo")
	} else {
            fmt.Println("snitch")
            for k, v := range m { 
                fmt.Printf("\tkey[%s]\n", k, v)
            }
        }
}

This seems like a nice solution, but does bring interfaces and type assertion with it seen in this example.

Let me know what you think, if you like it, i will implement it for all command functions.