That would be rather contra productive. Where you showed the percentage counter is the place where the folders are shown.
I wouldn't like to have my folders disappear every time I'm checking for new mail. And the mail ticker gives exactly that kind of information you're asking for.

But anyhow, this isn't the place for feature requests, though you can ask for support for your requests amoing other users. The right place for feature requests is the wish list:

You can insert wishes in the wish list, by logging in to:
https://www.ritlabs.com/bt/main_page.php
Choose 'The Bat! wishes' and add a new item.
First check whether someone has made the same wish, then you can
support that wish.
Wishes that are supported by more users are more likely to be granted
than wishes by one. And the system isn't smart enough to understand
that wishes might be the same.
And add just one wish per entry. Makes everything easier, both for
other users who want to add support and for the developers.