I tried searching around and was stunned to find that nobody has made a mod that is simply a graphically mirrored atmo thruster - I couldn't even find a discussion on it.
Now, I am not usually too picky about symmetry. I also am not a modder, though if I had more time and energy I'd love to dive in. But there are enough SE modders and enough people concerned about symmetry that I am impressed it is not done yet!
If someone is looking for an "easy" (relatively, I think?) mod idea that could likely gain some rapid popularity, I'd bet that flipping the model/graphics/animations of the vanilla atmo thrusters could get some attention - and I'd love for my little quad rotor-thruster drones to look symmetrical! If this appeals to some modder out there, I thank you in advance!
(If you would, please also remember support for creative symmetry/mirror mode!)
P.S. If I simply didn't search the right keywords or something and/or you can point me towards answers or alternatives, that'd also be greatly appreciated!