I think Bungie should add the Scorch Cannon that Scorch Captains use to Destiny. Make it a Heavy weapon, and exotic. I think you should obtain it by doing a questline similar to the Sleeper Simulant questline.
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Or... ya know... get Y2 Dragons Breath and burn the world! BURN THE WORLD! Purple Brick? BURN THE WORLD! Heavy Synth? BURN THE WORLD! WHO NEEDS A SCORCH CANNON WHEN YOU HAVE PORTABLE HELL?! [spoiler]Meh, scorch cannon would be fun to mess with people in crucible, the hype for a usable scorch cannon died mostly when HoW stopped being relevant.[/spoiler]