I know this is a very old thread, but I was so happy to see that this is planned for a future version of the software. I hope it's coming soon! There are tons of pre-populated items that we are never going to store--relish, guava, papaya, pancake mix, all wheat items--in fact, now that I'm looking at it, most of the pre-populated items are not on our storage list!
And, of course, the vast majority of items that we store are not on the list, so thank goodness that I can just add those in.
Thank you for considering this important feature. It's going to be so nice to be able to tidy away the unused items (or at least hide them!)