This is really simple, but there is no indication of how many emails I have selected.

The only way I can know is if I select all in my inbox for example, it will say I have selected XX conversations, and I can select YY in my whole inbox. From this I know there are YY emails are in my inbox in total. But when it tells me I have selected XX emails, this is actually not as useful since I already know how many emails can be displayed in one page. The moment I uncheck an email, the number disappears, leaving me with no current tally of how many are still selected.