[8][9][10] He proposed to change the constitution to allow Papua New Guinean police to deploy overseas on regional assistance missions, which would be supported by the parliament in January 2004.
[25] Domestically, he continued attempts to limit the supply of firearms and ammunition within Papua New Guinea, ultimately proposing a total ban on the sale of guns.
[33] In November 2004, he initiated a bill to regulate the security industry in Papua New Guinea, which was passed unanimously by parliament, successfully separated the pay structure for police from the other uniformed forces, permitting the police union to negotiate their own pay, and won executive support for the establishment of a gun control committee headed by former PNGDF commander Jerry Singirok.
[34][35][36] In December 2004, as Australian police finally prepared to arrive in Papua New Guinea, Kimisopa argued that the five-year timeframe of the program should be doubled.
[43] He labelled the ruling "devastating", declaring that the Australian assistance was vital for planned reforms to the police and suggesting a solution be found to "resuscitate" it.
[45][46] In July 2005, a long-planned gun summit was held in Goroka to finalise a report on addressing illegal firearms, resulting in wide praise for Kimisopa's efforts on the issue.
[47][48] In late August he faced the international media over a Human Rights Watch report about police abuses against children in Papua New Guinea, declaring that it was "something we cannot hide from" and again emphasising the need to reform in concert with Australian assistance.
[52] He split with his government over the Julian Moti extradition, declaring that "the law should take its course and diplomatic sensitivities should not override that", in contrast to Prime Minister Somare's staunch opposition, and stating that Moti's escape from Papua New Guinea "compromises the integrity of this nation"[53][54] He suggested that if the government of the Solomon Islands were found to have been involved in the escape, that Papua New Guinea would "now critically have to assess our relationship in terms of the bilateral relationship we have with the Solomon Islands".
[59] Following his defeat, Kimisopa served as director of the Goroka Preparatory School, and continued to be involved in justice-related issues as a member of the Community Coalition Against Corruption.
[68][69] In September 2015, Kimisopa sharply criticised the Australian government over high visa fees "only on Papua New Guinea citizens", declaring them "blatantly discriminatory".