Is there any workaround to make crossing parameter work?
Fortunately fencePickNode command works well with two closely positioned points and crossing parameter set to true, so I've ended up with that command.
BTW I have a proposal - to create Wiki page or a sticky page here, at maxscript section of Cgtalk forums that will contain things in maxscript that don't work as expected (or don't work at all). I believe nearly every maxscripter will find something to write on that page :)
That kind of page would be very usefull for everone - if you have a problem you just look up your command in the list and don't waste your time.