Rick,
I don't think it works in that way, such that there is a lateral force vector and a cue direction vector & that the tips it actually arcing.
I think the best way to look at it is that on impact there is an effective tip direction. Such that, even if the lateral swipe is significant, the CB acts as if it were being struck by a straight shot at a different direction to the bridge position to CB contact point. Whether the bridge is moving or not.
But the main point is that the spin:speed ratio will be about the same as if one just stroked straight, hitting the same offset from a different bridge position that is effectively equivalent to the swiping direction at impact.
One could argue that the effective end mass of the cue is reduced for extreme swipes. This is feasible but I imagine quite marginal, as tests have concluded.
Cheers,
Colin (Been busy for a couple of days)