I think it would be fantastic to import everything from the statement and then match things later.
You would end up with a one side trial balance if you did this.
Example - Payments:
You would credit the bank for the payments, but the system would have nowhere to put the debit. That's why you match before importing - to tell the system where the other side of the transaction is to be posted.
If you mean defer the matching to a later time, there is already the option to see previously unmatched items. You can click this when you come back into the import screen.
You won't be notified about changes to this idea.