Ah, I knew about "markfordelete" but "disable" sounds even quicker.
I would guess that the reason there are two types of skeletons (the ones from the war that you cannot interact with versus other ones that have been placed in the landscape which you can interact with and which are often in whole or part 'lootable') is a matter of game balance.
Bone is a fairly valuable commodity and if every skeleton in the Wasteland were lootable (along with all the ones that already are lootable, not to mention the ones that are lootable and respawn) it could lead to a glut in oil and that is bad for the economy. I mean just look at all those truck drivers on strike and blocking up highways around Moscow right now 