Yes, I understand and it has already been asked.
With few new suggested functionalities per day, I have to choose.
What you describe seems easy, but it is not for me.
For example :
- If you have defaults values in your DB structure, it is possible to inject in the sandbox database. No way.
- Also the file encoding is a problem
- I also consider the thousands of queries in one import, wich can be used to hack the website.
No, is no.
No way to do that for the moment.
By the way, the importing functionality (in the future), may also be limited in sandbox. (Maybe 5 records max per import for example)