Any way to change the "# of message unread" dismissal/reset duration?

[snovvman]

When there are unread SMS messages, the SMS icon shows the number of messages unread. When you select the icon, the first message is displayed. It takes two or three seconds for the unread counter to change.

When there are several unread messages, and I read them quickly, I find that I have to stop at each message for a few seconds so the unread count can clear.

Much like Desktop Outlook, I want to be able to configure the amount of time that the unread counter resets once a message is read.

It is likely to be a registry change. Anyone know where?

Thanks.