Maybe this has been brought up already, but here goes...
For chuckles I took a Tiger up against a town and after knocking down buildings, the destroyed buildings disappear but block all further shells or MG rounds from traveling beyond.
The second thing was the combat trim in the Tempest made it almost unflyable for me, manual and auto level was ok. This may have been just me, I only fly the P38 in the MA and haven't flown much else since September.