Yes but you call this "Rook Improvements" when it's the opposite. It's a.. deprovement.
A wall like you describe lacks any function except blocking passage.
The problem is, your pro players will find this useless.
Lets say ANY class has it. You're sitll talking about wasting 1 of the 4 skills. Each of the 4 skills needs to be awesome, versatile, dynamic, and synergistic to give it depth.
What the pro players would find useful is if you can make a wall to stop someone from running away, meaning you can cast it far from you, in someone path, not spawn it from yourself or right infront of yourself.
Or a prison like the Furion has in DotA.
Then it can be used multiple ways.. stopping someone from running if they don't have tele.
Could use it to block your own creeps behind you, while you kill the ones up front, letting your creeps pile up behind it then once the wall drops you have tons of refinforcements coming behind you.
Using it at the last second to block a melee character from reaching you.
But it needs to be more than just a wall or a prison, or it's a waste of a spot. How you describe i utterly loathe and would be detrimental to the gameplay.