Not currently. You could try moving the sendEvent function into the
public section, but, of course, that is modifying iui.js. If you add a
public sendEvent that calls the private one, you may be able to limit
your mod to a couple of lines so it will be easy to merge with newer iUI
versions.
If you open an Issue and request this feature and explain why you need
it, you might be able to convince us to add a better hook in a future
iUI. Sample code showing it in use would also be nice to see.
-- Sean