According to the 07 Wiki page -
"Players can speak to the Magic combat tutor in Lumbridge to toggle an option which allows runes to be placed directly into the rune pouch upon pickup, provided that the rune pouch contains at least one of the specific rune, and that there is space in the stack for runes.
Fairly simple suggestion - update our Rune Pouch so that runes you pick up that are already in your pouch, go to your pouch.
Would be a QOL update that makes collecting runes from kills or other ways a little faster and easier.