Thumbs scroll " mouseover/out doesnt work properly in Mobile devices

for tablets or mobiles are not available mouseover/out functions.
Mousedown/up are not available, that means marking to copy.

I am thinking option OnClick or or mouseover (tap) and define to scroll a number of thumbs to the left or right.

Actually, I added OnClick, however the scroll is until start/end, no limited range of thumbs.

gallery.js file udpated. Line #27
if(this.thumbs){
var u=tid(this.left), r=tid(this.right);
u.onclick=new Function(‘TINY.scroll.init(“‘+this.thumbs+'”,-1,’+this.scrollSpeed+’)’);
u.onmouseout=r.onmouseout=new Function(‘TINY.scroll.cl(“‘+this.thumbs+'”)’);
r.onclick=new Function(‘TINY.scroll.init(“‘+this.thumbs+'”,1,’+this.scrollSpeed+’)’);
this.p=tid(this.thumbs)
}

https://wordpress.org/plugins/slideshow-gallery/