[randomaccess]

No you dont HAVE to install eng-sound-mod.Ok basicly ENG-SOUND-MOd is exactly the same as the Mod activator except that it adds new ingame sounds, so you have to choose... Mods and new sounds or just mods. Once you have chosen which one you want to use You have to then install wrapper.dll before you use any mods, after that your all good to go. Only install the a/c installer if you are going to use mod aircraft.
Other than that your totally correct. Hope this helped.

P.s. Sorry for the late reply, was taking a nap.