WALLBANG FRONT OF A MAIN TO CONNECTOR/MID
There is actually a spot where you can shoot trough the box infront of A MAIN.
Start shooting from the very right corner to where you know connector is. The box is acutally hollow, and if you shoot trough it, the bullets will come out of a crate at mid. Just aim for connector (In your MIIIIIIIIIND) and shoot. Beware, it's not a oneway.

FLASH FOR B HALLS
I'm not quite sure if this could be usefull, but maybe someone could flash you in and you could clean up after that. DO A MEDIUM THROW (LEFT AND RIGHT MOUSEBUTTON AT ONCE)

FRONT OF A MAIN TO FORKLIFT
I guess when you want to completely smoke of A to rush in and get the bomb down, this could be a good smoke for a forklift player. (LEFT MOUSEBUTTON THROW)
B POPFLASH INTO HALLS (CT)
Just lineup with the line in the image, aim at the corner of the upper piece of metal and throw. It's very effective, I've used it lost of times since i came up with it and it really catches people offguard.