Given the limits of this plan, the alternative proposal seems more practical.
She correctly identified given the limits of this plan as an absolute participial phrase and an exception to the dangling participle rule. She wanted to know, however, if an absolute phrase could ever be used incorrectly and how editors could tell if it were.
It’s a basic rule of grammar that a subject and its verb must agree in number:
The cake is delicious. The pies are delicious. None are calorie free.
You were probably taught, as I was, that none is a singular pronoun because it stands for “no one” and as such takes a singular verb. Yet in the examples, none clearly refers to the cake and the pies, or “not any.” How can none, and other indefinite pronouns, sometimes be singular and sometimes plural?
In the one camp are people who think that and which should be used in different circumstances, exclusively. They feel those differences are vital.
In this camp, that is a word that restricts meaning; which does not. Which adds information but is not necessary to understanding the main clause. Satellites will fall from the sky if the spec docs use which where that applies.
Whither the subjunctive? The subjunctive mood is what we use—what we sometimes use—when we are expressing what is possible, what we wish to be true or imagine to be true but is not. If it is true, the mood is not subjunctive.
The thing is, not everyone uses it, and most people are OK with ignoring it in casual writing. The subjunctive may be going the way of thou and thither and whence and whither.