"ensure that a uniform policy is adopted by all RIRs"
This hasn't been a problem in the past. The details of implementation differ, but the RIR's have all done a good job of requiring justification for IP allocations and handing out IP space in appropriately sized chunks.
"reserve a pool of IPv4 addresses for future emergency allocation" Emergency to be decided at ICANN level.
Honestly, ICANN knows a lot less about IP allocation than the RIRs do. I don't think this is a good idea. If ICANN wants to do something useful for the IP address community, turn up the community pressure to renumber and recycle old underused allocations like MIT's 18/8 and Apple's 17/8. Regards, John Levine, johnl@iecc.com, Primary Perpetrator of "The Internet for Dummies", Information Superhighwayman wanna-be, http://www.johnlevine.com, ex-Mayor "More Wiener schnitzel, please", said Tom, revealingly.