Thank you for your comments.
As a matter of fact, to simulate plane/heli weight change after a cs weapon release is a very simple thing.
But the ability of disappearing the attached to plane weapon/s, exclusively depends on the way that the
Aircraft/heli developer has modeled the attached weapons : If in "Change payload" tab at Free Flight, you
are able to change plane's weapons load out by providing the corresponding weapon weight values at the corresponding
payload stations, than it's achievable.
This is the case with all Cataneo's planes (and the values are provided by Dino Cataneo at Aircraft.cfg).
So, btw, if you want to fly F-14D full "Phoenix" loaded, just have a look at Aircraft.cfg and give these values to payload stations.
Or if you'd like to see S-3B armed with 2 "Harpoons" missiles, that's the way to do it (regardless Tacpack that is).