Blocking war-flags was patched out, leaving us with grid-locking thingwalls with docks and logs so no one can warp in. Instead of trying to over complicate a solution to the cheesiness- this strategy of attack could be added into the game by giving war flags the power of shutting off the thingwall in the the last 10% of the flag's window.
"Don't just have an idea- have all of them." ~ Niv-Mizzet
Assuming the OP said something as stupid it can be compared to saying "we should wear hats made out of poop" can I ask you to do the equivalent of saying "poop is unhygienic and thus shouldn't come into contact with skin, let alone our heads."