It depends on what you're looking for. First of all, it is correct that homing on primary weapons doesn't work. The second is- you can work around that to a degree. You can make a primary that explodes immediatly after being fired, spawns a secondary that has a heat seeker (you can't use any Aspect or the like).
But from viewing your gameplay vids (I have 0 idea about SF besides that) I presume the way you did it is better than any fiddling around.