We would like to be able to set custom exr settings, 16b float, 32b float, and compression methods. Also, to define custom data windows and add custom metadata into the files.
Is that currently on the roadmap?
One thing that could hurt nuke workflows particularly is the current compression setting of block scanline. Nuke is REALLY bad with that, since its decompressing / handling images per scanline. So for every scanline, it will reread the same block of data over and over. The recommended nuke friendly exr compression is single zip scanline.