I agree with these comments - my big collection of Image thumbnails are taking a long time to regenerate. I would really like to "archive" the ones I'm not currently using in a project so that they don't get regenerated each time I open the file.
On renaming media clips/ images - yes, I'd like to control the naming convention for renderings and certainly would prefer to click twice on a name to make it editable, rather than find the three dots and select from Rename/ Delete/ Duplicate.
