Airstrikes from fixed-wing airpower such as fighter aircraft might also be cool. Both as a tactical aid or potentially as an enemy force. Perhaps one of the weapons could simply be a laser designation device for allied airpower.
Side note, I tried to recreate the lingering particle effects glitch by playing the game windowed in its native resolution and I basically just had a short battle with a mech, redeployed, and the effects were still there.