Both memoQ and Studio support different roles (Translator, Proofer 1, Proofer 2), a very important feature for proofreading processes.
However, I do not think this feature is really important for CT itself, but when proofing a file or a package from memoQ and/or Studio it would be somehow practical (maybe in a final step) to allocate this state to the file when finishing it.
The actual workaround is to open the proofread file in Trados and/or memoQ and to set the state or to fiddle around in any text editor.
I do not know how many of you need this feature, and for me it only has low priority (but a nice to have). What do you think?