FloppyEmu support for the IIgs is mostly simulating that Sony chip in the daisy chain board that routes the control signals from the IIgs floppy port as previously discussed here. I think the Also the firmware should be updated to support mounting 2MG format disk images that is commonly used by Apple II emulators.

http://apple2.org.za/gswv/a2zine/Docs/DiskImage_2MG_Info.txt

http://nulib.com/library/2img-type-note.md

The disk image manipulation program CiderPress is a good place to see reading/writing 2MG files in action (it also supports Disk Copy images too): https://github.com/fadden/ciderpress/