Tim, my weedburning torch is probably my favorite way to start lump, but a chimney works great, too. I find that lump quickly starts to burn very clean after dumping lit on unlit, unlike when using briquettes, especially Kbb. As for getting a long burn with the WGL, my buddy that has bought the stuff by the pallet says there's NOTHING that he's used that lasted longer. Come to think of it, he gave me a bag and I'd have to agree. Just pack it in like a puzzle and pile it up high if cooking for a long time. You shouldn't need to with WG, but with lump I suggest adding a few pieces of unlit through the door if the fire starts going down. Don't wait til it's going down to nothing, though. I'd rather play it safe and not end up with temps bottoming out, and I save what doesn't get burnt up at the end of a lump cook by shutting the vents down, anyway.
Lump burns a little faster so I especially recommend water in the pan for overnighters if you don't have an ATC. Other than that, the safety concern with lump is for the guys that cook on wood decks, but as Alan pointed out, WGL isn't one of the ones that's so prone to sparking in a chimney or when hitting with a torch. If someone's concerned it though, a lot of us use fully engaged briquettes from a chimney to light the lump in the cooker.