To answer number 4... probobly not, but you can do it with eagle bill's vaporizing pipe http://www.eaglebill.com/htm/frameset.htm. (Apparently Bill passed away in may ).
Anyways... it won't work with a regular glass pipe, or metal pipe because the hole in the bowl is at the bottom... meaning your flame isn't nearly close enough to cook the weed. Eagle bill's design makes the bowl the part where you actually put the flame up to, and the stem hole is on the side of the bowl.