Currently if you are in the levi sector, and not in the central mission, the npcs (hive and subfaction) pretty much ignore you. The hive should at least send a low level assault after all pilots, not just those in the mission.

Um.. they do attack you..?

They don't. If you sit back about 3k, they ignore you if you are NOT in the mission. Players in the mission get a set of bots that follow them around. I'll cap some footage this week to show you what i mean.

However if bots do attack players,this could make stacking ava much more difficult.

So? It's a Leviathan. They're supposed to be hard.