As I've played this build, I couldn't help but notice on some of the instances in which I was capturing an enemy flag that claimed a portal - I'd block the flow of units. So I decided to try it on purpose, this time with my own main base Portal at the start of the game. If you stand in the right spot, you will block 100% of the army flow 100% of the time. You dam up the units, and can hold them back for one major, huge push against the enemy! It was so funny, I took half a dozen screen shots so you all could share in the amusement of this scene.
Check um Out!

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Computer Specs:
Operating System: Windows XP Home Edition (5.1, Build 2600) Service Pack 3 (2600.xpsp.080413-2111)
System Manufacturer: NVIDIA
BIOS: Phoenix - Award BIOS v6.00PG
Processor: AMD Athlon(tm) 64 Processor 3000+, MMX, 3DNow, ~2.0GHz
Memory: 2046MB RAM
Page File: 1550MB used, 22838MB available
DirectX Version: DirectX 9.0c (4.09.0000.0904)
Card name: NVIDIA GeForce 7600 GT
Display Memory: 256.0 MB
Current Mode: 1280 x 1024 (32 bit) (70Hz)
Monitor Max Res: 1600,1200
Sound Devices: SB Audigy 2 ZS Audio [AC00]