After some searching for a way to change more that one block at a time I got to this post. Sadly there seems no change after over 2 years of discussions as many others have pointed out as well.
As much as I support adding a variety of global settings on the layout, my need is slightly different in that I like to change a selection of blocks at the same time. Obviously selecting "all" would achieve a global change.
Background for my request, coming from PPT I used slide background colour to identify a slide development status for reviewers so they can concentrate on slides coloured for review only. I know Rise has a review function, but, unless I'm missing something, that does not relate to a specific block so is quite useless as a reviewer will have to look at all blocks or other means needs to used to identify just what needs to be reviewed/approved.
Being able to select a number and/or range of blocks (similar to creating a template) and then change the settings for those would really help.