Re-enabling Data Explorer with custom master key

[travis-icorein]

To the best of my knowledge and understanding, changing the master key renders the data explorer ui useless.

Could modifying the startemu.cmd such that the key used is mapped to an environment variable allow the Data Explorer to access the Cosmos db again? Is the key baked into the Data Explorer code or does it derive the key from sources similar to those used in the startemu.cmd script?