Hey Talkat,
agree with you to map this wall. But the next question is how?
Looks like Israel is not in the list for the admin level. And this border can maybe considered as admin_level=3 ?
And the 1949 line as admin_level=2 ?
http://wiki.openstreetmap.org/wiki/Key:admin_level
BTW: We should think about the admin_level for central, haifa, jerusalem and south in OSM.