enableCellEditOnFocus does not work properly when a lot of columns.

[Daeamon]

http://plnkr.co/edit/vpms1zqjILXS1QoeCYlm?p=preview
To reproduce the problem you should сlick on the first cell, and then press the right arrow key until you force the table to initiate the scroll action. The cell outside the visible part of the table will not be active for editing.
I think that the problem is in the last line of the ScrollHandler function.

function scrollHandler(evt) {
        var newScrollTop = $elm[0].scrollTop;
    var newScrollLeft = gridUtil.normalizeScrollLeft($elm, grid);

    var vertScrollPercentage = rowContainer.scrollVertical(newScrollTop);
    var horizScrollPercentage = colContainer.scrollHorizontal(newScrollLeft);

    var scrollEvent = new ScrollEvent(grid, rowContainer, colContainer, ScrollEvent.Sources.ViewPortScroll);
    scrollEvent.newScrollLeft = newScrollLeft;
        scrollEvent.newScrollTop = newScrollTop;
    if ( horizScrollPercentage > -1 ){
        scrollEvent.x = { percentage: horizScrollPercentage };
    }

    if ( vertScrollPercentage > -1 ){
        scrollEvent.y = { percentage: vertScrollPercentage };
    }

    grid.scrollContainers($scope.$parent.containerId, scrollEvent);
}

[Daeamon]

If I comment out the 6328 line(scrollEvent.withDelay = false;), then everything works almost right (in that case if you do not press the arrow buttons too quickly).

[Daeamon]

// If we need to scroll on either the x or y axes, fire a scroll event
if (scrollEvent.y || scrollEvent.x) {
    //scrollEvent.withDelay = false;
    self.scrollContainers('',scrollEvent);
    var dereg = self.api.core.on.scrollEnd(null,function() {
      deferred.resolve(scrollEvent);
      dereg();
    });
  }
  else {
    deferred.resolve();
  }

[mportuga]

A pull request would be welcomed. However, I understand that may not be possible for you right now, so I will try to get to it this weekend.