Following a national trend towards capping medical-malpractice awards, D.C. doctors have asked the city to limit the jury-awarded sums that they claim have pushed medical liability insurance premiums to unsustainable highs and are forcing them to consider moving out of the District, reports the W. Times. In a press coference yesterday, the Medical Society of the District of Columbia — which represents 1,800 D.C.-based physicians — said that the average malpractice award of $584,338 has…