Hi @heike_riegler,
It’s a work-around, but OJS doesn’t require you to maintain a strict issue schedule. You could create an issue with a title “Current Publications” or similar, and schedule articles to it as they become ready. Then, when the “Current Publications” issue gets fairly full, you could rename it to “Vol X Issue Y”, and create a new “Current Publications” issue for the next batch.
Regards,
Alec Smecher
Public Knowledge Project Team