I saw a clip where RC Sproul is accusing people from Dallas TS of being Antinomian...so this is a little confusing to me.
That's because Sproul and other Reformed Philosophers are being totally disingenuous about the Dispensationalist's view of works. I'm not sure if this is the clip you're referring to:
http://5ptsalt.com/2013/11/04/r-c-s...an-the-sinners-prayer-and-more-antinomianism/
It is impossible to be as studied as he is and not comprehend what Dispensationalists teach. Since he misrepresents the view, I believe he is being dishonest and deceitful.
His label of Antinomian is nothing short of crooked, where he is intentionally spreading slander and libel.
Consider this article from Sproul's Ligonier Ministries, with material from John Gerstner:
http://www.ligonier.org/blog/antinomian-way-justification/
Same drivel as Sproul, the Antinomian label is thrown around a half dozen times in the first couple of paragraphs. Yet, consider this paragraph:
.....it does not mean that the adherents of this school are opposed to good works. It does not mean that it encourages people to do bad works or to regard works as something that they can casually neglect. On the contrary, they themselves are often zealots for good works. They always stress the advisability of good works. Good works are absolutely necessary for rewards. These preachers mightily urge people to abound in good works so that they may have an abundant reward in the world to come. Abounding in the works of the Lord, they teach, promotes a sense of blessedness and joy in the Lord even in this world. The absence of good works will disturb our fellowship with God. As long as they are lacking fellowship with the Savior, it is impossible to have peace, joy, or fruitfulness. If this continues, there will be embarrassment at the bema (judgment seat of Christ). In other words, antinomians usually enthusiastically urge Christians to do many, many, many good works in the service of the Lord Jesus Christ, and confidently promise them that they will receive a heavenly reward for every one of them, as well as present overflowing joy in the Lord. “Minus” here does not mean a negative attitude toward works. These antinomians are often quite positive in their emphasis and their practice.
The above paragraph is absolute proof of the misuse of the Antinomian label. Antinomians teach that Grace has given us a license to sin -
eat, drink and be merry. No Law, so no worries. Do what you want, there's no foul when you're inside of Grace.
Yet Gerstner wrote that the Dispensational view encourages good works.
His charge of Antinomianism is nothing but a scare tactic, like a charge of heresy. Who would want to embrace Antinomian theology? Who would want to embrace heresy? That's all this charge amounts to. Can't defend against them on scriptural grounds? No problem, just charge them with heresy in order to give his position credibility.
But if his position is biblical, it doesn't need dishonest charges of heresy. It should be able to stand on its own merits. Very telling, indeed.
Here is a really objective article by a (seemingly) Reformed believer that addresses some of this Antinomian charge:
http://davestheology.wordpress.com/2011/05/20/31/