already send campaigns for edit

You can simply copy the campaign you have sent, edit it accordingly while it os in draft mode and when ready, send it.
My customers are complaining,
before the last update worked the option to edit.
This problem will be fixed?
or now can only be done by making copy of the campaign?
Once campaign starts sending you need to pause it in order to edit it, and even so, you have very limited edit options because otherwise it would screw the campaigns settings big time.