what you want is the regular old SSM code, what you were linked to was 'local' SSM
for normal old SSM code you need a tag type 3 missile (note: you can also use a tag 3 beam) for triggering the strike, under the tag section you add an optional $SSM: entree, this specifies which subspace missile strike definition to use. if you only have one SSM definition then you want to use that one (it would be number 0)
tl;dr
make a tag 3 missile and add
$SSM: 0
under the tag section
now you need to define your subspace missile strikes, this is in the SSM.tbl (if you don't have one make a new one, it's just plane text)
http://www.hard-light.net/wiki/index.php/Ssm.tblthis is something that has been around seance retail, that
some unimaginable brilliant person /*cough*/me/*cough*/ hacked out of the original FS2.exe. unfortunately it was just not quite well enough developed to be useful, but after the source release a lot of things were improved. (like the above SSM index)
what you need for your purposes is something along the lines of
$SSM:
+Weapon: <name of weapon that comes out of subspace here>
+Count: <how many you want to come out at a time>
+WarpRadius: <size of the warp hole>
+WarpTime: <time it takes for the missiles to come out once the strike has been triggered>
+Radius: <radius of the warp ring (not warp hole) along which the missiles will come out>
+Offset: <how far in front/behind the warp ring will be from the thing that triggered it (i.e. the tag missile in your case)>
#end
that would be your ssm.tbl
