It would prevent having to rebank for npc contact runes (your bot also banks like 10 times for me at times before grabbing the npc contact runes, preventing problems like this) and being able to cast it faster, saving time so better xp/h, this and having astral runes in the pouch = no space lost and better xp, it could be this or making your bot run smoother seeing as it grabs 1 air then 1 cosmic then back to 1 air rune, if lets say I put air runes in my pouch your bot only picks 1 cosmic, at the same time astrals would be in the pouch and while running your bot puts the lava runes in the pouch.. both option = more xp/h
P.S the runes would be stored before rcing by us before starting the bot. Any runes rune pouch deposit could be an added option to check. all you would have to do is make it so the bot considers the existence and content of the pouch ^^ if not for the deposit of any runes in it. (just being able to use it would be an amazing start and about no work for you)