Quality setting for EXR DWAA format

This is a little one: make it possible to set the compression/quality of DWAA encoded EXR. I guess it is set on standard value of 45, that gives HUGE compression and very little perceptual loss, and I'd like to be able to set a different level of compression.
To show how and where this should be in the UI, in the mockup here below I just added a "quality" slider.