Sure, iTunes can join tracks, but only if they're consecutive CD tracks, and you haven't imported them. This script allows you to join any two (or more) MP3 tracks (repeat: MP3 tracks only), provided that they are the same format and bitrate.
Also see Join Together, an application that will join any type of files.
Perhaps of Interest...
downloaded 6m 6s ago
App displays files in iTunes Music folder which are not in iTunes library
downloaded 7m 59s ago
Append user-entered text to beginning or ending of selected tag of each selected track
downloaded 13m 24s ago
Rename selected tracks' Song Names with their filenames (minus extension)
downloaded 14m 28s ago
Remove iTunes tracks disassociated from files
downloaded 17m 39s ago
Perform search-and-replace on text in your choice of tags
downloaded 18m 21s ago
Use tag info from selected track to search Amazon Books for cover art