Found one workaround.
in RowSelectionModel.js there is custom function handleMouseDown
handleMouseDown : function(g, rowIndex, e){
if(e.button !== 0 || this.isLocked()){
return;
}
var view = this.grid.getView();
if(e.shiftKey && !this.singleSelect && this.last !== false){
var last = this.last;
this.selectRange(last, rowIndex, e.ctrlKey);
this.last = last; // reset the last
view.focusRow(rowIndex);
}else{
var isSelected = this.isSelected(rowIndex);
if(e.ctrlKey && isSelected){
this.deselectRow(rowIndex);
}else if(!isSelected || this.getCount() > 1){
this.selectRow(rowIndex, e.ctrlKey || e.shiftKey);
view.focusRow(rowIndex);
}
}
},
there is lines
if(e.ctrlKey && isSelected){
this.deselectRow(rowIndex);
}
So i needed to override this function and add some custom actions in above mentioned if.