Do you mean a vignette? If so try adding a solid layer with a radial ramp on it with white at the center and black at the edges then composite using the multiply blend mode.
I concur. Macromedia’s corporate culture infected Adobe. Perhaps that’s the bug that needs fixing.
Count me among the ex-Adobe fanboys. After more than 20 years supporting their products, I find myself looking for alternatives. Though as noted elsewhere on this forum an hour working in Motion makes you appreciate After Effects.
If you mean move them relative to the original layer’s keyframes you can either make them roving keyframes then reposition them or select all of them and alt/option drag the first or last keyframe into its new position.
I’m not sure what you are trying to achieve so I’m just making a stab at what your problem might be… have you also animated and eased the point of interest? Easing one and not the other can create awkward animations problems.