Something needs to be done about being able to drop troops near your own airbase. It's a pretty game breaking cheat when 30+ players annihilate an airbase and someone can hide a bunch of troops to keep the airbase open. Check the attachment image for the culprit (hint, it's the guy with 44 deaths).
I'm inclined to agree with you ScopeDope, but at the same time it's a great way to deny the enemy a chance of easily overrunning your territory. Just today I was trying to take an airfield with my teammates but planted Iglas kept giving us hell. It was a very smart delaying action.
That being said, spamming these units might be problematic. Perhaps only a certain number of troops should be allowed to be deployed within a certain radius of each other to keep the numbers down. Whether that's implemented or not, troop spam is fairly uncommon.