I've watched video 4 Weapons very carefully several times and I am unable to discern any active movement in any of the control surfaces, so I'm not sure what video you are watching.
Nevertheless, the developer says its there, so I'll take his word and chalk it up to poor resolution in the video.
If you're really more concerned with helmets and vests, this probably is not the sim for you. My understanding is that this will have higher fidelity than say Strike Fighters, but nothing coming close to approaching DCS authenticity or complexity.
I am looking at the very first video of the carrier takeoff where the flaps quite clearly go to about 25 degrees which is the least deflection with the flaps in VSTOL. Then the flaps drop further in concert with the nozzles, though you don't get a great look at it. Lastly, if you look at the ailerons, both of them droop to increase camber over the wingtips (below 165KIAS if memory serves).
As for the weapons video, there is some aileron movement though it is very slight. Purely by estimation, I'd say that jet is flying around at a fair clip and the deflection would not be great. Perhaps, it is underserved in the model currently...you'd really need more data to be definitive either way.
But if they went to the trouble of properly modelling the flap and aileron modes, I think I'm going to stick with the assertion that the control surfaces are moving appropriately in wingborne flight.
Incidentally, you will rarely see the rudder move appreciably on any swept wing jet. If you stomp on the rudder in a Harrier at high speed, you will quickly find the front end becoming the back...and you will have a massive headache from ringing your helmet off the canopy.
On the subject of helmets, etc I'm glad that you have an opinion hardcharger. I have my own and in this case I think that if you're going to go to the effort of making a detailed looking sim, you might as well get at least the most obvious details right. They clearly put a great deal of effort in making the jet look good. I would hope that they put a few finishing touches on it to make it look great.
S/F (I assume
Edit: I blew up the Weps vid to full screen. Take a look at the vid at about 6:10 or so as the camera pans around the plane up close. You can just see the ailerons move a bit, primarily down. Again, they just aren't going to move much for a moderate roll rate. Also, there is an Aileron High Speed Stop in the Harrier to restrict rate of roll above a certain speed, though I doubt he's moving the stick in this video more than a few centimeters.
Later, at about 6:50 as the jet is climbing, you will see the most deflected flight control, the horizontal stab. As he pitches up briefly, you can see the stab pitch down.
As for the rudder, watch throughout the video at just below the top of the tail to see the rudder break the line of the tail. It's very slight, but there's a definite gap at times. Again, you never turn with the rudder in a jet. But the Harrier, like most swept wing jets, has a Yaw Damper. The YD will kick in just a little rudder as needed as you maneuver and that's what you will see in the video.
Hopefully, that addresses your concern. I'd be cheesed too if the flight controls didn't move, but I don't think that is the case here.