After you bump a topic, a little red number countdown of 30 seconds that appears under topic tracker on the far right side

Do you mean a timer that displays your flood control located under your topic tracker? Personally I don't find any need for it.

It has already been suggested here, I believe it got closed because of the last post, not because of the idea being turned down:
- Flood Control Countdown Timer

Also, make sure you add a poll, otherwise your site suggestions will end up being closed. You can refer to this: How To Post A Site Suggestion