As the mod stands, you can't really add anymore weapons. There are currently 51 weapons precached. This means you are well over the 48 recommended allowance.
What you could do is to reduce the number of weapons already in the mod. For example, remove one or two of the MP40 weapons. There are 4 at the moment.
Tell me what weapons you want removed, and I'll see what I can do.
I am going to say, this is the very last thing I do for you. I am really busy at the moment. The only reason I have time today is because a client cancelled on me last moment.