Does this support exporting PNG immediately after modification, instead of using PS tools to open and re render it.
@Crane in the edit mode Aspose.PSD supports export to any supported formats including PNG, PDF, JPEG, BMP, GIF, TIFF.
Aspose.PSD supports editing of whole text in layer and editing of Text Portions with different Paragraphs and Styles
Please check docs: Working With Text Layers|Documentation