Of course, in real life one well placed 1000lb bomb will disable that runway until it's fixed. Here in AH it doesn't, because it's set to accomodate another non real life factor called the accuracy of level bombing in AH.
In real life a level bomber at any sort of bombing altitude would be very lucky to hit the runway with just one bomb drop.
So the real answer is to decrease the accuracy of level bombing, but allow for a larger blast effect and a crater effect. This would cause level bombers to drop salvos of bombs on fields to do damage, but if some hit on runways the runways would need fixing prior to use. Sounds like the real thing doesn't it?
What we have now is a B17 or B26 dropping bombs one or two at a time, aimed perfectly from high altitudes, and hitting specific buildings and targets. As a result the sim is set to have no cratering effects from bombs to overcome this shortcoming. It's a bit like the two wrongs make a right deal.
I would love to see that changed.
Ranger Bob