Pakistan

From a practical and prudent point of view, there are certain things that China and it's allies would like to see, done. The political, social and economic stability and growth of China and it's allies. Establishing networked cooperation between China and it's allies, whereby external threats that might infiltrate to destabilize the countries, are systematically and comprehensively, eliminated. Ensuring stable, patriotic, loyal and dedicated governments in power, for the countries who're allies of China.

What China and its allies would also want, is the gradual and specific ouster of Western presence in Afghanistan and the Central Asian Republics. Also, the establishment of strong inter-trade ties between China, Russia, Central Asian Republics, Pakistan, Afghanistan, Iran, Burma, Venezuela and Argentina. Economic growth between these countries, should be aimed in a manner, whereby the dependency on the West for trade, is to an extent (if not significantly) eroded/diminished.

These are the things that Russia, China and Pakistan should be focusing on achieving. Because if war is to erupt, in current circumstances, would be detrimental for all parties concerned. Plus, we should not forget, China needs to achieve the return of province of Taiwan, back into it's Union. Hence, its the time for consolidating gains, rectifying security deficiencies, stabilizing political leadership of China's allies and eliminating Western meddling in countries allied to China.

depends on the severity and the case of the hypothetical conflict, though i suspect China will be more neutral than anyone would have expected
Dizasta1 summed up nicely what should be done/pursued by China and her allies outside a hard conflict

regarding Burma/Myanmar, they have been flirting with the West lately as they implemented political reforms, time will tell should we see more drift towards openness and acceptance of Western power influence into Burmese politics and relations with China

its a game that everyone plays, including Pakistan in the past and as of now