Hi Tudor, one method you can use for that is the script here which sets the construction plane to the view frame:
http://moi3d.com/forum/index.php?webtag=MOI&msg=2599.8

re:
> i'm trying also via move
> pointpicker.restrictToPlane( moi.ui.getActiveViewport().targetFrame , true );
> am I doing smt wrong ?

Can you post the full script?

- Michael