Not without adding additional queries and the like. This modification utilises the information from the already done queries for new PMs.
You must have "Show New Private Message Notification Pop-up" enabled in your User CP.

Of course I have that.
It didn't even show up in the default style. Which template this affects?

This modification hooks into the default notices feature. It does not modify any templates. Create a notice and test of you can see it.

Are there any plans to make this able to stay until PMs are read? Can it be modified to use the PM notification indicator instead of the pop up to achieve that goal?

Sorry, just trying to help maximize the usefulness of the mod.

Still the same reply as in post #11. The problem is that notifications only fetch the number, and not any other data. I may implement this in the future.

"Not without adding additional queries and the like. This modification utilises the information from the already done queries for new PMs."

Can the text be phrased so that this can be used on multi language systems?

It is phrased. ;) (Search for the phrase and you will see.) You can add translations, however, you must do this all through the phrase manager, and not through the "vBulletin Options" page.

Thank you

I'm install but don't show box in difault style!

If your navbar is customised, revert it. (You will lose any changes made to the template.)