I have long liked this brief but insightful one volume commentary, and would love to see it in Accordance. I do own most of the volumes (as it has been republished as a series of small books) in Google books (for some unfathomable reason Volume 3 was never down as an eBook).
PS:It is designed to be used with the companion dictionary but i think it should be ok to have one with out the other.
The Mercer Dictionary of the Bible was one of my textbooks in Advanced New Testament a century or two ago. I've always liked it, and I agree it would be nice to have it and the commentary in Accordance.