Glad to know the flag is working for you. The refactoring was done to improve selection response in large/complex scenes (in some scenes, up to 20x faster). The algorithm was changed significantly so we introduced XSI_DISABLE_NEW_PICK to revert back to the legacy algorithm in case of issues.
Thanks for pointing out the lack of documentation. We have added that to the 2015 Readme but it might take a few days before the online docs reflect this change. Thanks, Hsiao Ming
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