They don't really 'control' metal. Instead, they ingest it (in a diluted, liquified form) and they are able to "burn" (read: magically deplete it) in order to cause certain effects such as enhanced senses, superhuman speed and endurance (running as fast as a horse for hours on end, for instance) and durability and strength, hide their usage of Allomancy (the name of the magic being used) or detect others using it, augmenting the effects of other metals when burned in conjunction, and a form of limited precog (seeing a few seconds into the future), though that ability is greatly limited in duration in a normal fight. They are also able to burn metal to push or pull and can use it to leap great heights by pushing off a coin or to use the coin itself as a powerful, bullet-like projectile. And they can burn metals which can allow them to influence the emotions of those around them by either dampening certain emotions or inflaming others.
From what I know of Doom, I think it sounds like a stomp in his favor
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"Luxe, calme et volupte." - Charles Baudelaire, The Invitation to the Voyage