support more or custom spline fit algorithms
As mention in the comments for "Fix spline plots" (http://highcharts.uservoice.com/forums/55896-general/suggestions/871839-fix-spline-plots-to-draw-a-better-generalized-line), sometimes the built in spline fit method is not acceptable. It would be great if there were other fit options built in (like D3: https://github.com/mbostock/d3/wiki/SVG-Shapes#path-data-generators) or allow custom algorithm to be plugged in.
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zac
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Actually there is such a method, getPointSpline. It computes the line segment from one point to the next. It takes arguments for the whole segment, the point and the index, so you can add the surrounding points to the calculation as well. See http://jsfiddle.net/highcharts/6sQjJ/.