Hello,
I'm not sure about a script/workaround to batch change all absolutes to relative, I hope someone more proficient replies to you here.
As for #2 - Do you mean that Corona Bitmap, when drag and dropped texture assets from S24 Asset Browser, renders as full-black and does not recognize the assets similarly to how native bitmap does? This is handled in the brand new daily build that's coming today.
Thanks,
Jan