Can you create a wall/object where 1 team in counter-strike can pass through but the other team cannot?
Currently there is a plugin called walkgaurd that allows you to create a wall, but it is unable to be set to a single team.
Here is the link to walkgaurd here
http://forums.alliedmods.net/showthread.php?t=55245
The feature is called block-zone on the walkgaurd page.