You can't move because your player is locked, type "mpcheat playerlock0" in the console or just class a weapon.
I know that can be done on any wall, my point was, where is it a problem? Where is it an advantage? Where should we focus on fixing it?
You're such a noob when it come to offline playing.
There's no reason to use
multiplayer cheats when playing offline (i.e
singleplayer)

.
Just "class r" will give you a weapon and unlock you.
It also helps doing "god" and "deathstalker", last of which gives unlimited ammo.
I know what "see through walls" shit they're talking about and I know it's a problem for a lot of places, hell most of all places, the whole Pipeline map for instance. The thinner the wall the easier this is to do. However, I don't know of an easy way to "fix" this. As I believe it makes your camera go on the other side of the wall, it doesn't matter how many anti-portals you put there...