passing additional params to a registered data supplier
As far as I can make out, if I register a data supplier in a plug-in

eg
```
registerDataSupplier('public.text', 'menu label A', 'MyDataSupplier');
```

The function that the action is assigned too - will only receive the `context` param

Would it be possible to configure an additional _custom_ parameter which is also include

eg

```
function onSomeAction(context, options) {
  // Menu item A clicked...
}
```