Separate athoritative and recursive DNS queries

Hi to all, I'm involved in a constructive thinking. Some clients asked me for the posibility to split all DNS queries in a two different flows first o one of them for authoritatives queries and second to recusives in order to balancing those flows between a differents pools, using the LTM DNS functionality. I've been seeing the differents variables from https://devcentral.f5.com/wiki/iRules.DNS.ashx but i'm not sure if it can be possible do that. Kind regards to all.