Is it feasible/acceptable for me to convey my concerns to staff regarding performance of classmates on coursework reports?
An undergraduate student is absolutely in no position to make any institutional changes in regards to the problems you've observed. In many cases, even the full professors have little ability to change the situation, due to departmental or administrative requirements for certain passing rates or median scores out of a class, etc. Possibly the faculty have seen this, and/or counseled concerned students about it, hundreds of times already. 

You should take some amount of confidence that this is evidence you're ready for your next big step (which seems well-timed, in that your Master's starts next year). You know how to properly research, cite, support, and use LaTeX to write a paper; and you will doubtlessly be using those skills in your next position. 

Frankly, the librarian was very much out of place to put the burden of responsibility for this on an undergraduate student. I call "foul" on that.