"- Walls: Level of walls is not taken into account in spy battle"
Level of wall has never in the history of travian had an effect in a spy battle ........... yet its after 12 years a bug ??
Why don't you just say that you want to change the game (in a for me very odd way) rather than its a bug-fix
If you increase it will be much more costly to get scout reports midgame, hence making it easier to deffend, harder to attack (again, again, again) but its for sure not a bug-fix??