Not really, but guess what, just use Java! 🙂
<cfset foo = [1,2,3]>
<cfset bar = [4,5,6]>
<cfset foo.addAll( bar )>
reference: Java’s Collection Interface API.
source: http://www.aliaspooryorik.com/blog/index.cfm/e/posts.details/post/merging-two-arrays-267