When assigning a Role to a Workflow State, the Assignment field sets what kind of access the Role has to content items in that state. The choices are Assignee (read, edit, and transition), Reader (read only), or None. Is there a way to add additional choices to this? Specifically, I’d like to have an access level that allows a Role to read and transition, but not edit, content items in a given state.
This is something we’ve considered in the past. However, it is not part of the current product.
Dave
Can we get this on our wish list. I was able to do this in v4.5 Yeah I know I’m old school 
We would also find this useful. Add it to the ideas forum and I will vote for it!
I agree - this would be really useful