Mail Monitor: Left click icon to mark all read?

Would it be possible to add a feature to Mail Monitor where left clicking the icon button just marks all mail as read in the mail list?

I like getting the animated notification that one of my accounts has new mail, but I don't use the mail list. I just open my browser window to gmail to see what the new mail is.

Currently, I always have to right click on the icon and select the menu item "Mark all as Read" each time.
Just left clicking would be a lot faster.

Thanks!