If you want Boros, you need beatsticks to make it work like Kiln Fiend, Steppe Lynx, Goblin Guide, and Reckless Charge. A minor white splash won't do you any good unless you're pushing fast dudes through for damage and then finishing up with burn. This is the Burn thread...if you're not just paying red mana for efficient damage, you're not playing burn. Grim Lavamancer and Goblin Guide usually the only exceptions, and Goblin Guide can force an argument that you're playing sligh, not burn.
I know of one fish deck that has dropped Cursecatchers for Mental Misstep...but doesn't play Standstill. I honestly haven't seen many fish decks using Standstill for a while...most have dropped Standstill for Kira, Great Glass-Spinner, a black splash Saito-style for Perish in the sideboard, or a white splash for Swords.
I think Standstill will get back in there, though. Turn 1 Vial/Mental Misstep, Turn 2 Standstill is really, really strong. Fish doesn't have to sling Force of Will at Wild Nacatl or Goblin Lackey anymore...they have 4 more weapons to do that with MM. Standstill then steps in to put them so far ahead in cards (after you commit to breaking the Standstill...because you HAVE to so you can start a clock) that you probably can't recover. Fish is situated nicely ATM. They can counter your turn 1 Lava Spike/Chain Lightning, play Standstill, and then draw 3 more cards to have 3 more answers to your burn spells. This is when you really have to look at Burn as a combo deck...and they just countered your combo pieces.

