What you would do is setup an onmousemove handler in the On Scene Load for the hit element. The code would look like:
// setup variables
var hitAreaName = "Hit_Area_btn";
var timelineName = "global_animation_timeline";
// add handler for mouse move
var element = hypeDocument.getElementById(hitAreaName);
element.onmousemove = (function (event) {
// determine how far we are in the hit area box
var rect = element.getBoundingClientRect();
var percentage = ((event.clientX - rect.left) / rect.width);
// map to a time in the timeline
var time = (percentage * hypeDocument.durationForTimelineNamed(timelineName));
// go to that time
hypeDocument.goToTimeInTimelineNamed(time, timelineName);
});
Note that in Hype the On Drag action does this without any code, although requires a mouse down for the drag which I know you’re trying to avoid 
.
Here’s the file I have with it working:
MouseOver_Triggered_StopMotion_Animation-fixed.hype.zip (777.2 KB)