I'd like to see an adventure extension that adds mini bosses along the way to Heretic. They could be random or otherwise, they could be standing in our way to the core or guarding special systems in a branch off the main gates line(For example the special Charon sector in The Network.) Story-wise, they could be Iocrym drones sent to investigate human activities and/or destroy suspicious threats, or rabid experimental bioship from the Ares, or maybe space octopus. I don't have the ability and patience required for a mod like this, but I wish someone can make it.
Also, is it possible to add systems past Heretic via mods? We can make our own version of post-Heretic events. If not, maybe we can make a copy of Heretic in the middle of the topology, and find some way to skip the real Heretic, so that it would be like we really got past Heretic and not just a copy.

Yes, look at my avatar, I have a wyvera type ship.