If you wish trade the news, you will have to go with a non-dealing desk broker that uses STP (straight-through processing) and trades directly on an ECN (electronic communications network) with interbanks.
The reason brokers widen spreads or lock platform during times of news is to protect themselves. Since most brokers offer fixed spreads, during news, they're unable to guarantee those spreads, so they lock platforms. Other brokers because they take the opposite side of your trade will widen spreads or manipulate price (rarely done these days in G8 countries due to tougher regulatory oversight) to make sure they don't lose money.
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