Indeed, blocking out the basic routes can help alot, it doesn't take long, then you can take measurements of how long it takes going from A to B, Ct spawn to A and B and T spawn, and T spawn to ct , A and B.
Comparing the times of T and CT you will see who will possibly have the upper hand in what areas.
You could even draw a quick nav grid for bots to run about on, and see how balanced it is after about 3 hours of 5on5 or so. ![]()
According to this you could add shortcuts, or even change the entire layout or make some routers longer/shorter.
Taking these steps will probarbly improve gameplay on your map if it's as good a you want it yet.