I've been discussing editing knuffel rooms page with Lady River in the Knuffel Guide-ish thing and how playing around in the rooms can be a little overwhelming for the users who own big amount of knuffels. So we came up with two features:

1) Sorting rooms by equipped and unequipped, Lady River also suggested sorting by regular and wild knuffel. If combined there would have to be 4 options:
Equipped Wild Knuffels' rooms
Equipped Regular Knuffels' rooms
And the same for unequipped.

Or we could just have this not combined, whatever works I guess

2) Empty all rooms button in the main Rooms page (entered directly from the Knuffel tab in the menu). Maybe each knuffel from the list could have a box to be marked. So you could mark the knuffel rooms you want emptied. And the button would be "Empty marked rooms".

Yeah, I didn't even know I needed it before River put it to my attention. But the more I think about it, the more I need it I emptied my regular's rooms a long time ago and now I'm confused which are finished and which are untouched xD Same with wilds

I don't think an average price would be of much use for most items, especially older ones. If you, for example, take an old item that's 8+ years old, that was sold for maybe 1k at the beginning and was also sold more often years back, when it was more common and now the item is sold at 100k only once a year, the average price might well be in the 10k range and that doesn't reflect the current sell-for-price at all.

As for the last price the item was sold for: That's already shown in the diagram!

What might be interesting to show with the old prices would be something like "currently listed for (lowest current listing price)-(highest current listing price)".
It would be just a convenience feature, since you can of course search for that already, but I found myself wishing for that when listing my doubles of the new digging items, since some of them don't have many sales and the price changes fast.

But isn't that why we have the last year chart? For a more current understanding of the prices?

That tells you only something about the sales that actually happened, not about what people are currently listing the item for.

I agree it would be handy to have an info about the current listed lowest/highest price. It would be easier than just opening the market in another page and checking whether someone had listed that particular item.

But what people list items for is - at least in my opinion - not very relevant, if the item doesn't get sold for that price, because everyone can list an item for whatever price they want. If no one is willing to buy the item for that price, it's not really "worth" this price.
If someone sells, for example, an item from the current Monthly Treasure for 50000 and that's the price that is shown to other potential sellers they might take it as the items current value and list it for a similar price, even though no one ever was willing to pay that much for the item. It might even lead to more inflation that way. It's, if all, rather missleading. I think only the price of an item that actually get sold for the price that was asked for it reflect the items current value.