When reporting a certain post for a certain offense, often times, you get the warning: "Invalid post specified, or post already reported."

I suggest making posts and/or topics reportable multiple times (much like voting, 1 report per post per person).

I have no idea what the mod que looks like, but with this addition, it would show the number of people who reported a certain post/topic.
This way, it would create a priority based report que, with the biggest number of reports on a subject at the top.

I believe this would help the moderators determine which topic should be closed immediatly and which can wait untill there's more time for them.

Let me know what you think

Will only mean that the most viewed topic get many reports, not necesarily the worst posts get mosts reports.

No.

Isn't that why we have the options to report for multiple things in the first place, so reporting becomes "priority based"?