Not sure I understand your question??? When I do HST's, I add 1" to the desired finished size. For QST's, I'd probably do 1.5". As to 'rules' for speed piecing???? Just cut as many of the fabric pieces as you need, line/stack everything up and keep feeding into your machine...thus 'chain' piecing. When done with all of those, clip the threads between each pieced block and do your pressing or whatever in the same fashion. Match up your next set of seams and follow the same process.
Also, I believe, if use the 'advanced search' function at the top of the screen you can do a search on 'exact term'.
Good luck.