To Boldly Go ... Split Infinitives and All discussion

As a freelancer (not so much in my full-time job, since we proof our edits along with adding author corrections after typesetting), things seem to go one way or another. If I'm copyeditor, they want me to perform both copyediting and proofreading jobs, under just the copyediting rubric. If I'm the proofreader, it seems like the job is often a "just proofread but add a little copyediting flair in there" sort of mentality.

What have you run into?