Well in my opinion the maker has all the say in how the WH is made. There are no restrictions of any kind other than size
So as a couple of people have said -- Go for it! It is your choice.
So if you leave an applique edge unsewn it is ok. And if anyone is bothered by an open edge they can always add a little stitching to secure it if it bothers them. For me how the maker made it is just fine. I have one "Doll Quilt" I got in a swap a long time ago and it is not quilted and is very wrinkled because of no quilting. But it is beautiful just as it is! I love the work she put it!
If anyone wants to add a hanging sleeve that is great and if you don'/t we all have ways of hanging a WH with out a sleeve. I use a stapler and just put one staple in each corner. Quick and easy. And if anyone examines it too close and sees the staple that is just not a problem for me lol
Yes I wouild advise adding some sort of label. You can add a fabric square with all the info or you can write your info on the WH with a fabric pen. If you forget to add one it's not a problem. I have forgotten and just now realized I didn't add anything to a Trivet I made for a swap. LOL Oh well. I might make a label and send itt to her