uff.. thats a good question. Mono R isn't that good for Commander, since many burn tactics doesn't work in multiplayer with a higher life pool. But don't get disapointed here, as long as you have fun with your deck, its fine.
for future advices, it would be interesting to hear how the deck performs in your playgroup and what makes trouble.
Okay, nevermind, I've already got some advices:
Neheb, the Eternal could be interesting for your deck. with cards like
Aggravated Assault he could allow you to finish off the game with endless combat steps.
Insurrection could be replaced with Mass Munity or
Mob Rule. Both are a little more restricted with the targets, but cheaper.
I assume you know the combo with
Godo, Bandit Warlord +
Helm of the Host, right?
Since you want to play with your opponents decks, what about
Stolen Strategy?
Another haste enabler like
Fervor or
Mass Hysteria could also be interesting.