It will be a nice enhancement to have the ability to change values with two thumbs.
I can make this done a bit later. What do you think?

I think it should be work this way:

1. If click between thumbs - move the closest thumb to the mouse point
2. If click before the first thumb - move it, else if click after the last thumb - move it. Of course, we should respect rtl.

Version: 2.6.0
Angular 4.3.5
AngularCli: 1.4.0-rc.1

When running on universal I get the following error

ERROR TypeError: this.el.nativeElement.querySelector is not a function
    at Draggable.getDragHandleElement (C:\dev\git_clones\app\node_modules\ng2-drag-drop\src\directives\draggable.directive.js:136:49)
    at Draggable.applyDragHandleClass (C:\dev\git_clones\app\node_modules\ng