No support. You say people don't wish to sell their slayer tab for a low price in bulk and wish to wait, so why not just sell it while doing your next few tasks? If people were that fussy about it they would just do more tasks. Theirs a collect all button which makes selling things so much faster. You don't even have to click sell then click the item, just click the item and mash the -5% and it's sold.. This will just make everything so easy..
I wouldn't mind a few more slots to sell items. I do hard / elite clues often, that stuff goes to the Exchange and sometimes it sits and sits and sits till sold. I usually lower the price 10% - 20% to move it but this doesn't help at times.
What I would like is variance factor. I buy some things in bulk at time. Stuff for disassembly in Invention. I will go in and by like 500k Incandescent memories and just wait but after a day or so I have to go back and adjust it and be in que again because the price went up a few GP since my last offer. Like this..... I want 500k yew logs. Price is 318 GP a log. I put in that bid but add a buffer of say 5% more in case the price increases until my completed transaction. When transaction is completed and withdrawal I get my logs and any remainder of the 5% variance I put in to cover the price fluctuation.