Hi Pete.

F-14D Air Weaponry : YouTube, v=HArBeyXYwvU

This can be achieved for any military FSX plane that the appearence/disappearence of weapons on board is modelled to the weight change of the relative payload stations. This is the case with Tacpacked planes (ironic ?...) as the freeware Cattaneo's planes are.
I achieve this in FSX Missions where mission .xml code :
- sets all payload station weight to 0 for a clean configuration
- sets specific payload station weight for attachment of specific planes weapons upon them
- detects when a CS Weapon is being fired (by proximity trigger to area attached to user, ie "entrance"-spawning of a CS Weapon in that area), setting relative payload station weight to 0, resulting at proper weight & visual effect upon weapon firing !!!...

So :
1. The attached to plane weapons, are the ones by the plane developer made (not the CS Weapons). But the essence - having proper weight & visual changes - doesnot change or affected really.
2. This is for FSX Military Missions and not for Free Flight. Though it may sound complicated, is very simple & straightforward (at least for me...).

A side note :
Though Free Flight is good for taking screenshots or making videos, only in FSX Missions you can have the interactive v-environment (through triggers & conditions) for FSX Military Operations.
Personally, I feel restricted by weapon addons working exclusively in Free Flight and not in Missions. Hopefully, FSX@War works in Missions as well.

BTW, I'm Xpel (some issue with new forum & cam't log in).