Hi Hadri1,

re:
> is there a way to select all the point of a given U iso line from a single
> point selection ? (same for V iso)

This is possible now with some script methods added in v5, see
"Update surface control point scripting." at
http://moi3d.com/forum/index.php?webtag=MOI&msg=11970.1

For expanding from a single selected point of a surface to the entire U row, paste this as the "Command" part of a shortcut key:

script: /* For any selected edit points on a surface, expand selection to entire U direction row */
var objectpicker = moi.ui.createObjectPicker();
objectpicker.allowEditPoints();
objectpicker.done();
var objects = objectpicker.objects;

for ( var i = 0; i < objects.length; ++i )
{
	var obj = objects.item(i);
	if ( obj.isSingleFaceBRep && obj.hasSelectedEditPoints )
	{
		var face = obj.getFaces().item(0);
		
		var numu = face.numControlPointsU;
		var numv = face.numControlPointsV;

		var flag = [];
		flag.length = numv;

		for ( var v = 0; v < numv; ++v )
		{
			for ( var u = 0; u < numu; ++u )
			{
				var index = face.uvToEditPointIndex( u, v );
				if ( obj.getEditPointSelected( index ) )
				{
					flag[v] = true;
					break;
				}
			}
		}

		for ( var v = 0; v < numv; ++v )
		{
			if ( flag[v] )
			{
				for ( var u = 0; u < numu; ++u )
				{
					index = face.uvToEditPointIndex( u, v );
					obj.setEditPointSelected( index, true );
				}
			}
		}
	}
}

This one for V:

script: /* For any selected edit points on a surface, expand selection to entire V direction column */
var objectpicker = moi.ui.createObjectPicker();
objectpicker.allowEditPoints();
objectpicker.done();
var objects = objectpicker.objects;

for ( var i = 0; i < objects.length; ++i )
{
	var obj = objects.item(i);
	if ( obj.isSingleFaceBRep && obj.hasSelectedEditPoints )
	{
		var face = obj.getFaces().item(0);
		
		var numu = face.numControlPointsU;
		var numv = face.numControlPointsV;

		var flag = [];
		flag.length = numu;

		for ( var u = 0; u < numu; ++u )
		{
			for ( var v = 0; v < numv; ++v )
			{
				var index = face.uvToEditPointIndex( u, v );
				if ( obj.getEditPointSelected( index ) )
				{
					flag[u] = true;
					break;
				}
			}
		}

		for ( var u = 0; u < numu; ++u )
		{
			if ( flag[u] )
			{
				for ( var v = 0; v < numv; ++v )
				{
					index = face.uvToEditPointIndex( u, v );
					obj.setEditPointSelected( index, true );
				}
			}
		}
	}
}

re:
> one all the point of an iso curve are selected, is there a way to move them
> in the U V or N direction ?

Sorry no, not currently.

- Michael