Dear Alex,
iSRD is a powerful tool and for most customers, it works very well.
It's normal to have the button frozen in WorkflowPilot mode. It will unfreeze, once iSRD is the next tool to be adjusted depending on your selected workflow. However, there
are workflows, which do not include iSRD at all, e.g. scanning reflective material.
If you are using SilverFast Ai Studio, you will have a lot of possibilities to set up iSRD. You will have a 1:1 preview, you can work with masks on several layers to treat different
defetcs differently. With iSRD you can do a lot more than with ICE.
I suggest you get into contact with our support team here: http://silverfast.com/support (Just click through the assistant for a support form.)
We really would like to help you.
Best Regards
Christian