Some of the foreclosures and short sales I have viewed included some things you did not want like snakes, syringes, needles and more.
Still, over the past five or six years, buyers would ask for whatever they thought they could get as a concession. You name it...TV, gun vaults, pictures, riding lawn mower.
And very often the sellers would "throw them in" to close the deal. That was the market we operated in for about five years. Buyers controlled much of the negotiation.
But the times have changed. Sellers are receiving multiple offers. Prices are rising.
Still some buyers are asking for closing costs to be paid, offering "low ball" prices, asking for the appliances - even if not included.

Go ahead, ask for everything including the kitchen sink but remember this... The cleanest offer (price, fewer contingencies, etc) will usually prevail.