By hack, I mean that I wanted my article to appear on both "business" and the root. Well for some reason once you choose "business" you can't get that checkbox that says "submit also to reddit" to be active. Although it seems to work with "programming". So I chose programming, checked the box, then re-selected the business topic. The little checkbox stayed checked, although it was dimmed. When I hit the submit button, it gives me that "submitting too fast" message.
Took about an hour to figure out that the "too fast" message must be some kind of fall-through case. Once I did not "hack" the UI, the submission went through okay. I still don't know if the UI was broken or working correctly, but the error message sure could use some improvement. (as well as the UI, imo)
First, a human marks certain users as very legit. There need only be one marker. Next, the users those marked users mod-up in the normal course of the site are added to a white-list of users that can submit at any rate.
This wouldn't be hard, would be completely opaque to the users, and would avoid annoying messages thrown at your most active real users.
There are many, many problems with reddit.