There are 2 things I would like to see added:
a – The option to hide a widget- the block would turn red when hidden
b – The ability to save a custom row layout – which you can then be retrieve as you would retrieve a widget type.
Currently to get around this I created a page named, “Archived Blocks.” This allows me to archive custom rows (which are populated with widgets) as a preferred template, example: Breaking News. If there could be a library like there are for widgets, for row type templates, that would be grand.