Recognize other "global" patterns, not only "window.x"

How much would it take to support "bad modules" that pollute global namespaces by doing

```
var myfunc = function() { return 42 }
```

or

```
function myfunc() { return 42 }
```

or even

```
this.myfunc = function() { return 42 }
```

?

All of these are out there in the wild, but none of these can be turned to "good module" using deamdify now. Unfortunately language parsing is Greek to me. Is it feasible?