Hello. I would like to suggest that the Skaven bombers become a regular spawn - similar to the groups of Plague Monks or Savages. The bombers should have some sort of restriction to their spawning though, both to make them unique and not overbearing. If they do become a regular spawn though they probably shouldn’t drop ammo.
I was thinking they could be a rare spawn for Skaven hordes. This would be a fun way to challenge players.