You're totally right, Sebastian. Although a variety of ordnance has been issued previously, all of it has been bundled along with a limited edition of a specific model (except for the VF-1 ordnance pack, like you said). I would love to see some day new ordnance packs issued as accessories, like the X72-series and X48-series of weapons for WWII and modern military aircrafts.
Hasegawa Model Co. has been 'cooking' an increasing amount of new macross models and/or variants, and now that its crews are incursioning on the Macross Frontier line might suggest they'll be working on the add-ons for the VF-25, and the VF-171, VF-27 and VF-29 sooner than later. Maybe it's time for them to 'milk' our wallets with a comprehensive selection of underwing weaponry.
Like you, I wouldn't mind to get my hands on new RMS-7s, or maybe MDE missiles, or the stealthy PaCSWS-1. I'd be happier of having a more broad spectrum of weapons to hang below the wings of our models. Although knowing the fact that many VFs have micro missiles besides the gun pod and some other fixed armament, a good underwing loadout looks to me a like more proper attire for combat than just using a different livery or adopting a camo pattern, just my $.02.