I have a bookmarklet for mass submit ISRC without 1 hour delay.
Remember to always go back to release edit history and leave an edit note in the Add ISRCs edit with release URL and where you got ISRC from (from CD with this/that ISRC extractor or from this/that website).
The bookmarklet points to a fork of a @kepstin script page.
- You go to a release page and click this bookmarklet to open it.
- Then you can select an ISRC field and paste a text blurb, it will paste multiple ISRC in sequence.
There are two demo animated GIF over there.