At the last meeting we talked a bit about the new button that lets you start a custom order from a conversation. In case anyone is curious how it works, I just did one and after I pressed that button, I was able to set up a listing (add a photo, description, price, shipping cost and time), and when I was done, it was published as a private listing and the person I was convo'ing with was sent a message.
I think it's neat because the custom listing doesn't show up in my shop- I can only see it if I look at my listings settings. So that should eliminate any problems with other people accidentally buying orders that are meant for other people (not that I've had that problem, but I've heard of it). I don't know if you can make a private listing through the usual route of adding a new item.
Also, I think we talked about people being able to request custom orders from items in your shop and how that might be a problem if you can't make that item into a custom order. I just noticed that there is a checkbox in the item listing settings that you can uncheck if you don't want people to be able to request a custom order from a particular item.