This is, perhaps, not the best idea.
I mean, you midaswell just remove every mech that isn't the highlander and be done with it.
Yes, I want to remove the JJ reticule shake hindrance to jumping mechs, and not just poptarts. ALL jumping mechs would be affected, especially the mobile skirmishers that rely on their JJ maneuverability to survive that are my preferred build types.
Yes, poptarts were broken before, all snipers were broken before, because their primary, go-to weapon, the PPC, was overpowered. That has been fixed. PPCs are no longer the OP god gun of doom that they used to be, so all of the misdirected, shotgun-pattern nerfs that PGI put in to counter them are no longer necessary.
I want screen shake gone so that poptarts come back as a viable (but no longer OP) build strategy, to counter the heavy AC boating builds you see all over the place. I also want screen shake gone so that I can brawl with my Trebuchet again, and so that other medium and light brawlers and skirmishers that rely on JJ maneuverability can become viable again.
Furthermore, this would NOT penalize all mechs. Yes, this would affect all mechs, but the only mechs that would be affected by it to any significant degree are the long-range, direct-fire mechs, and the fast speedies when engaging at their longer ranges. The shorter-ranged brawlers would barely be affected by it, because they're not moving fast enough, and the distance to target at the ranges they fight is not great enough, for the additional lead time to be significant.
Besides, adding mech velocity to weapon velocity would make poptarting HARDER, because poptarts not only have to account for their horizontal movement relative to the target, they have to adjust their aim VERTICALLY, to account for their own vertical movement.
Removing screen shake won't suddenly make poptarts king again, because the ability to make snap shots while jumping is NOT what made poptarts king - it was the fact that the primary weapon of poptarts was horrendously overpowered.
If you fire two Gauss Rifles at a target, with movement compensation added, the two Gauss Rifle slugs will still meet at the exact same time as where you expected, dealing their damage to a single hit location.
The only thing this does is make it where you just have to aim at a different spot in space for it to land where you want it. It doesn't modify where the damage lands when fired together.
As I noted in my original post, mechs that have all of one weapon type would not lose pinpoint accuracy, but they WOULD still have to adjust their aim more, making precision shots more difficult, unless they stop and stand still, making themselves an easy target. There are also only a handful of mech chassis that can mount 2 Gauss Rifles, or any other weapon set of the same type that will generate 30 or 40 points of instant damage, and those chassis have their own drawbacks.