Currently you can do something like that in Copy, Save and FTP dialogues if you use the option to Apply Metadata template, where you could set up rating color and tag for all the processed images. The issue is that this template is not dialog specific and is a global metadata template setting.
Adding something like
Set Rating
Set Color
Set Tag
as standalone settings to these dialogs could really help, without the need to dive into Metadata Template Dialog every time.
But also having a LOCAL Metadata Template option for everything would be awesome