When provide large step value, handle dragging is hard. Need a smooth drag support

[soundar24]

When provide a large step value (consider step as 20), the handle movement feels hard to drag. Sometimes it is better to provide a smooth dragging and when release the handle it should go to the nearest value.

[soundar24]

In the below demo, it looks hard to drag the handle: http://jsfiddle.net/soundar24/LpuLe9tr/229/

But in the below updated demo, the handle having the smooth drag: http://jsfiddle.net/soundar24/LpuLe9tr/230/

An property will be added in the source to achieve this behavior, in future release.