Quote: " The second bug is that some enemies just stand until they are shot at, then they begin to attack me"
The question is - It happens always or on big map with many enemies and objects?
FpsC even with BIM is very sensitive to dynamic objects with scripts, and from what I've seen - your maps are quite big and got a lot of dynamic objects with physic on. That's a lot of stress on the engine, and sometimes it just cant run everything at the same time, that's why some enemies react very slow. When you got powerful pc, you might not be noticing slowdowns, but try to make your map lighter, and you should see some difference.
Another thing that might be helpful is modifying the script. Open it, and you can easily adjust some values, so enemy would see, and react to player from further distances. I modified chase10 by adjusting plrdistfurther and plrdistwithin to higher values, so enemies react from far far away, but that's working bug-free only when engine isn't very stressed.