Great plugin! Tested and works fine, Hoping that it would be included on the next Highcharts release :)

"Could not connect: Access denied for user 'highcharts'@'ec2-54-221-87-5.compute-1.amazonaws.com' (using password: YES)"

can't get to the plugin...

Has this functionality been implemented at all yet? I'm trying to achieve the same thing and for the life of me cannot figure out how.

that's true, however, when one of the columns are closed, the open column will transform to a wider column and the corresponding scatter point will remain on the same spot. Something like this: http://i55.tinypic.com/zvwgo8.jpg

Well, i am trying to fake it by update function at the moment for each click in series hide/show.

Based on your image, you can actually try to hack those point positions for the spline by adding intermediate x values. The categories are internally handled as values 0,1,2,3 etc. By adding float x values you can place the points anywhere: http://jsfiddle.net/highcharts/LLExL/407/

I do not know if this helps but the code breakdown for the image I have provided ( http://i56.tinypic.com/2cxypow.jpg ) is below, kindly note these parts: series[x].stack = 'something'; they work for getting column series on the same vertical line however, not for the spline points.

options.series[0] = new Object();
options.series[0].name = 'Scored Half Time';
options.series[0].data = new Array;
options.series[0].type = 'column';
options.series[0].color = '#BCED91';
$.each(s5, function(index) { options.series[0].data.push(parseFloat(s5[index])); });
options.series[0].stack = 'halftime';

options.series[1] = new Object();
options.series[1].name = 'Conceded Half Time';
options.series[1].data = new Array;
options.series[1].type = 'column';
options.series[1].color = 'lightcoral';
$.each(s6, function(index) { options.series[1].data.push(parseFloat(-s6[index])); });
options.series[1].stack = 'halftime';

options.series[2] = new Object();
options.series[2].name = 'Scored Full Time';
options.series[2].data = new Array;
options.series[2].type = 'column';
options.series[2].color = 'green';
$.each(s3, function(index) { options.series[2].data.push(parseFloat(s3[index])); });
options.series[2].stack = 'fulltime';

options.series[3] = new Object();
options.series[3].name = 'Conceded Full Time';
options.series[3].data = new Array;
options.series[3].type = 'column';
options.series[3].color = 'red';
$.each(s4, function(index) { options.series[3].data.push(parseFloat(-s4[index])); });
options.series[3].stack = 'fulltime';

options.series[4] = new Object();
options.series[4].name = 'Full Time Results';
options.series[4].data = new Array;
options.series[4].yAxis = 1;
$.each(s1, function(index) { if(s1[index]=="1") { options.series[4].data.push(parseFloat($minmax-1)); }; if(s1[index]=="0") { options.series[4].data.push(parseFloat(s1[index])); }; if(s1[index]=="-1") { options.series[4].data.push(parseFloat(-$minmax+1)); } });
markNegative(options.series[4].data, 'red');
options.series[4].stack = 'fulltime';

options.series[5] = new Object();
options.series[5].name = 'Half Time Results';
options.series[5].data = new Array;
options.series[5].yAxis = 1;
options.series[5].color = 'purple';
$.each(s2, function(index) { if(s2[index]=="1") { options.series[5].data.push(parseFloat($minmax-1)); }; if(s2[index]=="0") { options.series[5].data.push(parseFloat(s2[index])); }; if(s2[index]=="-1") { options.series[5].data.push(parseFloat(-$minmax+1)); } });
markNegativex(options.series[5].data, 'lightcoral');
options.series[5].stack = 'halftime';

yes you are right about grouping, but the spline points should also be stacked with the column.
thanks for clearing that out, it is kinda hard to explain it to be honest.

Just to clarify, this issue seems to be about grouping rather than stacking.
I had a very hard time figuring out what you were asking for until I realized that...

example: http://i56.tinypic.com/2cxypow.jpg
so basically if the half time result and the full time result (spline points) are same, they are on the same spot not in the same vertical line with the related columns although they are stacked with the columns.