Sometimes we have finished MD files which we would like to see always in Preview mode and others which we are creating and Edit mode is our default. It would be nice to put a piece of config information in the frontmatter in each file and when a file would be open in Obsidian it will use this information and run the appropriate mode.
frontmatter parameter to control edit/preview mode
For example I use Dataview for rendering overview pages.
These are not modified at all, so it would be very useful to have these pages always be displayed in preview mode by setting a flag in YAML section.