I would prefer a admin level for the wall instead, because this road you pointed at, is just shown on zoom level 16 and invisible on zoom level 17 in Mapnik and Osmander.
With the admin level 4 it would be visible in lower zoom level and this way it will be more useful. We have the same issue with the Golan heights that are declared as admin_level=2.
For example to
Level 2 = National Border by 1949.
Level 4 = Physical border (wall) between Israel and the Palestine authority
Level 6 = Mahoz (North, Center, South, Tel Aviv, Jerusalem, etc.)
Level 8 = Municipal (Moatsa Ezorit, Moatsa Mekomit, town, etc.)
For example to do maps like this and inform people about the current situation and the walls:
http://www.btselem.org/Download/Separation_Barrier_Map_Eng.pdf
BTW: Seems like the Palestine mailing list is offline: http://lists.openstreetmap.org/listinfo/talk-ps
Any other way we can involve our neighbors into this discussion?