Hi again,
No, it does not need to be stored, but in case it is not, you loose your statistics every time aMule shutsdown. Doing so in a per session basis should be very easy.
There is just one problem now

Adding a column to the display breaks configuration file compatibility, I once wanted to add a column, but Kry "pulled my ears" because the code I wanted to commit would not keep compatibility. Unfortunately, I don't have time to hack into this, I would happily break this compatibility because it would be a one time break, but hey, I am not the boss

So, I hope we hear from Kry.
Cheers!