eli_stergiouli
Gimp seems to have limited support for .ora unfortunately.
We're focusing on stabilizing physics, skin folders and PSD processing, and currently we have no particular plan on supporting new file formats. We just had a thought about it.
Regarding alpha inheritance not exported in PSD as a clipping mask I saw on Krita issue tracker that there are issues opened since 2015/2016 and they are silent. That's not good news. Maybe you can try to give a +1 on those issues.
I can understand how frustrating it can be to copy and merge everything. Maybe we can add a [clip]
tag to treat the layer as a clipping mask, but that would be very specific to Krita.
We'll think about it and see what we can do. If something reasonable can be done to support your use case, we'll let you know. 👍️