1) be used as a context menu item in Finder (create a new Automator workflow with the Run AppleScript, cut and paste this into the box, and then Save As Plugin for Finder)

2) mark each of the files as a distinct chapter, to make it easy to jump to the start of each file

The code:

on run {input, parameters}
	tell application "Finder" to set input ¬
		to sort input by name
	repeat with i from 1 to the count of input
		set this_item to (item i of input)
		tell application "QuickTime Player"
			if i is equal to 1 then
				make new movie
			end if
			open this_item
			tell movie 1
				rewind
				select all
				copy
				select none
			end tell
			close movie 1 saving no
			tell movie 1
				add
				select none
				if i is equal to 1 then
					set this_track to make new track at beginning with data "Chapter 1"
					set enabled of this_track to false
					set the name of this_track to "Chapter Track"
					set chapterlist of track 1 to track "Chapter Track"
					set the movie_length to the duration
					tell chapter 1
						set the time to 0
						set the duration to movie_length
					end tell
				else
					set the newmovielength to the duration
					set the duration of this_track to newmovielength
					set the chapter_list to the name of every chapter
					set the new_chapter_list to chapter_list & (i as string)
					set the contents of the current chapter track to the new_chapter_list
					set the time of chapter i to movie_length
					set the duration of chapter i to newmovielength - movie_length
					set the name of chapter i of this_track to "Chapter " & (i as string)
					set movie_length to the duration
				end if
			end tell
		end tell
	end repeat
	return input
end run