Although I don't think that I can help you, I would like to understand your question. You said:
I'm using a mod that does not list members with new posts
That doesn't make sense to me. Does that mean that every time a member makes a new post that you hide their name from the member list? If so, does this modification also hide all their previous posts too? I assume that you review their posts and then "enable" others to view them in the member list and their post.
You continued to say:
now it is time to delete members without posts
I can understand that request and that is a good question, but if a member has "NO" posts, then why would that throw off any counts? What type of count did you have in mind? A member with no posts to me means a member with no original posts (topics) or replies. That means no counts at all. No?
Don't take offense in my question. I am really just trying to understand. I do like the question, though, although it strikes me as a bit rude that if a person in good faith creates and registers a profile, why should their be a time limit that they should create a post?
Thanks in advance,