I think I've added all the warnings now

CMakeLists.txt

@@ -420,15 +420,33 @@ if (WIN32)
     set_target_properties(openmw PROPERTIES LINK_FLAGS_MINSIZEREL "/SUBSYSTEM:CONSOLE")
 
     # Play a bit with the warning levels
+
+    set(WARNINGS "/Wall") # Since windows can only disable specific warnings, not enable them
+
     set(WARNINGS_DISABLE
-        4099        # Type mismatch, forward definition of a class is really a struct
-        4244 4305   # Storing value of one type in variable of another
-        4309        # Variable overflow, trying to store 128 in a char for example
+        # Some unneeded and sometimes completely retarded warnings that /Wall enables
+        4820 4514 4710 4986 4668 4625 4626 4571 4640 4548 4512 4350 4917 4619 4061
+        4623 4263 4264 4266 4996 4347 4628 4510 4610
+
+        4099 # Type mismatch, declared class or struct defined with other type
+        4100 # Unreferenced formal parameter (-Wunused-parameter)
+        4127 # Conditional expression is constant
+        4146 # Unary minus on unsigned type, result still unsigned
+        4242 # Storing value in a variable of a smaller type, possible loss of data
+        4244 # Storing value of one type in variable of another (double in float, size_t in int, etc.)
+        4265 # Class has virtual functions but no virtual desctructor (-Wnon-virtual-dtor)
+        4305 # Truncating value (double -> float for example)
+        4309 # Variable overflow, trying to store 128 in a char for example
+        4355 # Using 'this' in member initialization list
+        4365 # Variable signed/unsigned mismatch
+        4701 # Potentially uninitialized local variable used
+        4702 # Unreachable code
         )
 
     foreach(d ${WARNINGS_DISABLE})
         set(WARNINGS "${WARNINGS} /wd${d}")
     endforeach(d)
+
     set_target_properties(components PROPERTIES COMPILE_FLAGS ${WARNINGS})
     set_target_properties(omwlauncher PROPERTIES COMPILE_FLAGS ${WARNINGS})
     set_target_properties(openmw PROPERTIES COMPILE_FLAGS ${WARNINGS})