fireEvent is now back I see at github. Is there some discussion where we can follow things like this? I already updated some beta code, and it's simple to replace again, though I was wondering how I could be up- to-date with updates like that (I now stumbled upon this by accident visiting github for 2 mins)..?
In the last comment here (by cpojer) I think there will be triggerEvent in 1.3, but not after 1.3 ("we're not going to overwrite...")...? https://mootools.lighthouseapp.com/projects/2706/tickets/705-no-way-to-access-native-ie-fireevent-method