That feature request appears to reference supporting looping conditions, which is now supported with the createLoopingConditionContext()
API. All the old APIs around the event sheet manager, current event etc. where previously only there in order to support looping conditions, which is now more conveniently handled with the new API.
I'd rather not expose the internals of the event system, as it is a very large and complex API, exposing such details to addons can severely limit our ability to make future improvements, and I'd rather addons did not tinker with the event system anyway, as sometimes addon developers do things that contradict the intended design of the event system. We could consider small, specific features, if they have a clear and important use case that cannot be feasibly achieved any other way.