Webinar - limit chat function

Is there a way to limit the number of messages users can send in a Webinar chat? We unfortunately get lots of chat spamming during our webinars, so it would be great to be able to limit the amount of messages each attendee can send by time frame - e.g., attendees can only send one chat message every 30 seconds. And is it possible to limit the character length of each message?

Any tips/suggestions would be welcome!