Some great ideas here.
This is what I would try:
Decrease the bombsight zoom range just a bit more. Make it harder to pinpoint small targets from high altitude.
Delay the bombsight response. Put in a "green light" like brand W. Make it harder to hit multiple targets on a single pass.
Provide dense targets in city/factory/refinery areas, protected by heavy medium ack. This would encourage high altitude carpet bombing, and discourage low alt feeding frenzies from nearby fields.
Delay ack response to targets that are not on radar. This would encourage the low level sneak attack. (And I just think this is real fun.)

Make acks respond to near misses with a "head down" delay in firing. This would make jabo more viable.
Step radar detection of heavy bombers, medium bombers, and fighters. Heavy bombers show up on radar at 20 miles, medium bombers at 15 miles, and fighters at 10 miles. This would identify targets to someone studying the radar, forcing the heavies to higher altitude and making jabo more useful.
popeye
[This message has been edited by popeye (edited 06-16-2000).]