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Well, rather than Boros, this is Oros (for want of a better word for the shard trios). But that ain't no thing.

In any case, though, I don't really think Black brings a lot to this deck. Gatekeeper of Malakir requires a heavy colour commitment (and is really just pretty okay anyway), Edge of the Divinity isn't terribly good (especially in a deck that's mainly R/W), and the rest of the Black cards are just dudes who do stuff and are pretty good, but aren't really important enough to bother with the third colour (okay, Sorin, Lord of Innistrad is good, but I wouldn't include Black just for him). Elite Inquisitor is a metagame choice, but against most decks he's nothing special, so that depends what your opponents are playing. Five-Alarm Fire I don't really see as very useful.

As for what to include, I'd go heavier on the tokens. Assemble the Legion is probably your top card. Precinct Captain is good as long as you can force him through,  so maybe something like Goblin tunneler (and a few more cards for him to work with) would work out. There are a lot of cards which would work out; here's a relevant Gatherer search. Dawning Purist and Augury Adept look good to me. They'll help solve your problem with early plays, too.

Really, though, it seems like you could do with more token-makers. assemble the Legion works by itself, but only comes down on turn 5 and until then you're relying on Precinct Captain . I have to go so I'm not going to look it up, but R/W has plenty of ways to make tokens.

High Priest of Penance isn't bad, but his mana cost is a little awkward alongside things like Precinct Captain and Aurelia, the Warleader . That said, your mana base seems like it shouldn't have massive problems supporting it, so if it's working it's fine. It doesn't really do anything to bring in the endgame, but it's a versatile deterrent (although myself I think it's interesting enough to make the centrepiece of its own separate deck).

Timely Reinforcements is fine if it's working. It's not worth it if you only expect to get one of the effects regularly, but it's a good boost to start your token production early on and it's good if the board is being cleared regularly.

Five-Alarm Fire is okay I guess; just as an efficient burn spell it doesn't do that much, but it's a good rattlesnake. I'd just be worried about it occasionally not switching on when it's needed, or being destroyed before the counters go on. Depending on what's needed, it might be better to stick with Seal of Fire or Seal of Death . Or Seal of Cleansing . I don't know if it's necessary in your group, but multiplayer games often bring up a lot of nasty artifacts and enchantments, and High Priest of Penance is a little too awkward to rely on when something like Goblin Charbelcher comes down and needs to be destroyed before that player can untap.

Oh, and I think it's worth going up to four Frontline Medic if you can. There's still not quite enough token production to be able to throw guys away to get Batallion working, so he should help you trigger Firemane Avenger reliably. You could also get a nice trick going with Frontline Medic and Magus of the Disk (or Nevinyrral's Disk , or whatever board sweeper you like).

And I'm still not sure that Precinct Captain is a reliable token producer with nothing to help him get through. As well as Goblin Tunneler , there's Firefist Striker on-theme. But I definitely think he needs something.