Hi David,
I will detail what i wrote in my first message, based on a recent exemple i've just had.
I wanted to review all strings containing 'URL' in french language. I've first done the work on standard components, because it would have been to much strings with 'everything' selected, and it's more important to work on standard components.
When i still have some time to continue the work on it (i could yesterday), i don't want to see anymore components i've already worked on (generating lot of results). But i don't have easy solution to see only what i've not already done (non standard components).
I should 'select all' and then click on all standard components (to deselect them), or click on all non standard components. Tooooo much in each case 
How could i achieve that?
I think i'm not the first or only one to first work on standard components, and then on non standard. Of course, when you only want to translate/review translation on just some components, it's not a problem. But when you have to work on everything, it could be useful to be able to first work on standard, and then on non standard (because you don't have time to do everything at the same time).
Séverin