I'm new in open layers and I'm trying to make some interactions with my map. I'm using ol extension like a longtouch and after some time i want to show fetaure on the map. It works fine with this extension but the problem is that it is shown after releasing the click. 

Is there any way to show added feature on pointerdown event not after releasing the click ?.

Here I have an example. `http://viglino.github.io/ol-ext/examples/mobile/map.interaction.longtouch.html`