Sorry, but I'm sitting here looking my Wing official tech manual and collection of official art/screens...these are not vectorable thrusters. The way they're constructed it just isn't possible. The built-in ones in the feet are vectorable because you can move the legs, but in all but one case (Space Leo) the back-mounted thrusters aren't vectorable. (Even the main thrusters of the Space Leo weren't vectorable, but the drum-mounted ones extending from either side of the backpack rotated.) Maybe, maybe they could use electromagnets to duct it without moving parts...but in addition to the power usage and additional weight (computers have to be shielded from them, nevermind the electromagnets themselves) problems, if they could do that there is an obvious application as a defensive technology. If you can duct reactor plasma like that, you ought to be able to redirect a beam cannon too.
The vernier mounts on Tallgeese and Wing Zero are probably vectorable, but they're never actually shown doing it. Wing and Epyon could both clearly move their heavy back mounts...but Epyon also clearly relied on a set about waist-height, rear, for main motive power. Judging from every other OZ MS that wasn't vectorable.
I am mayorly talking about Seed, Wing is just an small point in Gundam, as Gundam is just an small point in...***** ***** *****..., basically robot rotates it core and while still looking forward for firing it can move barwards, it's just like having a Booster pack in your back, you can be looking or firing to a different side from which you're heading, side thusters is another story, but I bet some desing have it, and even if they don't, I believe it works like this in games, you just need to see any Armored Core...or any other robot game (there a few series with lot of games to get an idea), battle ships also have rotatory thrusters to the sides, though they work more like the Harrier ones...
The vernier mounts, all later Models have this usually, I think if you see a game will surely get the movement much better than in a manual, if you take the out the strafe movement, which is maybe little compared to the forward, you loose the ability to evade shoots, aside front that the evasion becomes the same as if you we're piloting a ship, I am not sure about what models, but while a ship can mantain a fixed relative position around a ship which is moving forward a robot could...
Shadow, any chance can I use your Funnel?
I'd post screens of the two Zeon ones but you already seen them.
A - No, well I am not too sure (a "maybe"), it's wrong see why:


Basically, do you see the 2 "Triangles" in the lower part that move to become to transform from Shield to Funnel, well see mine only have 1 triangle, so there is no real point....
There is a way of making this possible, maybe we'll surely need Animation Code with SEXPs (not implemented / Feature Request), but it's possible to made that transformation (which should not be hard, believe me I have tried to make things much harder than that, that's what I mean with: there are much things you can do with a mecha...)

Looks like you are well ahead of me Shadow.
I barely discover the SCP about November, and registered in Hard Light at December, since then I can get this out of my head, I get 3D Studio Max about a month or so ago and here I am with a few Tuturials (some were pretty useless), it's strange at the start I see things like guns, arms really hard to do, but once I have done one of them is like that kind start seem to be easy to desing...hope that happens when I complete one (and I don't even have the any of the Series, to have some good close up detail, that was throwing down my hopes, but for some reason I can't ignore it, even if my resource of data is low...)
I have another Models, but I don't want to draw too much attention, not until I have a full Mecha, then it will be party
B - The Zeon is a robot without legs used by charles (while it still uses it mask), you mean from "Charles's Counterattack"