ControllerTimelines

Is there a sane way to manipulate the composition time or to change the start of timelines?

I have a case where I want to animate a camera path around some 3d (just cubes, don't get too excited ;) but this animation can be triggered at any time. I want the animation to start when the macro that contains it is enabled, which makes sense.. but it actually starts when the composition starts, and the timeline has therefore ended before it's supposed to start.

So is it possible to trigger the timeline patch at all? Or is there another way of using spline based animation (without coding splines in javascript if possible!) If not, is it possible to somehow control the time within a macro, so it effectively gets a local time when the macro gets enabled?