Okay so I know in build 25 you can only spawn your rockets and whatever within a certain distance from the brain but it appears that the enemy still uses a designated LZ. What I wanted to ask about was if there's a way to make the enemy spawn anywhere on the map EXCEPT for the area where you can spawn your transports. I'm asking because I mainly play Skirmish Mode and play a king of the hill type mode and it gets kind-of annoying killing actors on only one side of your base...

I've noticed that too. The enemy seems to only drop to the left of me and seldom attacks from the right.

I've used this to my advantage when building my base.
I'm sorry i don't have a solution but i think i will try building at the wrap and see if they more evenly attack from both sides then.

AFAIK the enemies don't follow drop zones, but they drop so far to your right that in a looped map it seems as if they would be dropping to your left.
You can notice this if you try the Glacier mission in Gotcha!'s MP3, the enemies will just spawn outside the map and immediately die.