Really excited about Fusion 2.5+ release for 31th march! But what about the price? Don't want to see it as a surprise, can't you just speak about it now so we know how much we will spend for this extension?
And to answer @Volnaiskra
You could use groups to group your sub-events When they are too long.
Something that could be useful for you i guess, is to be able to check an option that stick on top the primary event When it has too much sub-events. That could be useful in some case and a problem in others (ex. too much conditions in the primary event).