Unadvertised rank perks - "/ssell all"

I just discovered that I can use this command. This command lets you sell all sellable items in your inventory without opening a GUI. This is a rank perk to my knowledge (had another player without a rank test), but is not advertised in the petalshop. Not sure which rank gets this command It's also worth noting that the Civ KOTH buff does work with this command (just not /sell) on a related note, /ssell hand is disabled (may or may not be intended, but I think that's why I didn't find this earlier)