Do you have a suggestion for MiniBB that will allow users to report bad posts so Mod/Admin doesn't have to have to go through every single post?

By suggestion, do you mean "extension"?

I don't know how special this would be, and why it can not be merged with Private Messaging addon, for example, or Direct Email addon.

I would like to see something that would give options why it should be deleted, and then simply delete or ignore the report, similar to the approve and delete the premodmsgs script

I think the Checker addon does a great job - no need to read any emails. :) I wouldn't assume all abusive posts would actually be reported (plus you'll have to spend a lot of time just reading the "report stories" among which half are subjective) so a good forum without every-day active moderation would be hard to achieve..

I would like to see something that would give options why it should be deleted
In most cases, topic is deleted or moved because it's not compliant with the rules. Refer to your forum rules in all places, like we do. You do not need to work for the users, but users should follow your rules. If they don't follow, it's their problem.

We have no plans anymore to introduce additional big new features like this in miniBB. Upcoming release will cover some new additions, but that's all. I'm tired of fixing new bugs because of new features, and I am interested in the stable program, not full-featured.