I certainly hope that since I paid for the very raw and not quite finished software that I will be awarded upgrades and extra perks if this ADD-ON really takes off.
With every update or SP that Weapon for FSX gets, you will be entitled to it. That should make you happy on that score.

The one thing that I would like to see is the actual impact, explosion, fire, physical damage and the dust
Make sure that you have advanced animations checked (ticked) in Options > Settings > Display > Global options > Advanced animations.
I see all of those except physical damage. You can't see physical damage UNLESS it is modeled in the aircraft MDL file. Only the developer can do that, not Captain Sim.

I would like to see the actual weapons mounted on the aircraft as well.
As far as I know, only the developer can do that too.

One other thing I should mentioned is that when I fire a missle my entire screen freezes for several seconds and then continues.. I can not see the missle fired from my aircraft at all but I can hear it.
I don't have this happen to me unless there are a lot of AI aircraft around. I get to see lots of missiles fire from my aircraft that I have "loaded" Weapon for FSX on to. They are not mounted on the aircraft, of course, but as soon as I press the fire button, I see the missile(s). This is an awesome spectacle with the Hydra 70 rockets!

Mark