Something I have always found frustrating is that during LCoG & ToT, unless you are camping on Shop Titans constantly managing your shop all day you will find your inventory space steadily dropping as more and more items flood in to the point that it may cap your limit even if you give up and just start selling the lowest tier fodder items to customers at base cost.
This is inherently un-fun and adds a stress factor to running your heroes on the event because there's the ever present risk of getting items auto vendored while you plead with RNG to send more customers into your overflowing shop.
My suggestion is that once or twice during ToT, and twice during LCoG the Customer Frenzy buff be applied in order to ease the backlog of items building up. It seems like it would make sense since all the shops suddenly have tons of hot new merchandise from from special dungeons.
I am aware one can already toss items on the market to alleviate this, but between DI items usually needing to be stored on the market and my preference for turning every single item into exp to level up faster I find that option to be less than ideal. This suggestion gives players the option to more easily manage the influx of items without having much an impact on market sellers.