We should be content to stop at God's prescriptions and patterns. Otherwise we are free to take communion standing on our head if it were possible. If that sounds impious, why is it not impious to take it kneeling which sorts us with idolaters as the Puritans would say? What I'm saying is hardly novel.
Here's Ridgley briefly on the subject:
A body of divinity: wherein the ... - Thomas Ridgley - Google Books
Here is Philip Henry's objections to kneeling at the Lord's supper (Matthew's daddy):
The life of the Rev. Philip Henry, A ... - Matthew Henry - Google Books
Knox/Hopper on the subject.
Southern Presbyterian review - Google Books
Thomas Shepherd (from his life)
The works of Thomas Shepard: first ... - Thomas Shepard - Google Books
I'm not sure if anyone more recent goes into this as minutely as George Gillespie or not. He puts the question of actual idolatry within these bounds (which he then follows with arguments, in his popish ceremonies part 3 chapter 4):
§7. The question about the idolatry of kneeling between them and us stands in this: “Whether kneeling, at the instant of receiving the sacrament, before the consecrated bread and wine, purposely placed in our sight in the act of kneeling as signs standing in Christ’s stead, before which we, the receivers, are to exhibit outwardly religious adoration, be formally idolatry or not?”
If anyone seriously wants to dive into this question with Gillespie I will offer my new version of that section (about 30 pages) which is more easily followed I think than the 19th century version online. To big to post and you will need to agree to use it for private use only as I intend publication in early 2013. Private message me if interested in the PDF.
I'm sorry that my interaction on this is so spotty, but this is really all I have time for. Perhaps some of our other defenders of Puritanism can step in if these resources are not enough?