[imp] Show all mails of a mailbox instead of i.e. 20

[Elmar]

Hi,

in Sqirrelmail there is a button to show all mails of a mailbox instead of 
only a number of x (default in IMP: 20).
That makes it alot easier to browse through all mails and take some actions.

In IMP I found no way to list all mails of a mailbox like Squirrelmail 
without changing the "messages per page" parameter.
Is there any solution / patch / plugin or else to do that in an easy way 
(like a button)?

Thanks a lot and greetings
Elmar