Hello,
I'm not sure if I will help you with my advice, but I really appreciate to use taskjuggler mixed with org-mode. There is somewhere in the web an org-exporter to taskjuggler. I think recently a topic on this matter appeared in this list. Taskjuggler can help you optimizing complex plannings and can be used in a professional context. For sure you will need to invest some time on it but it is a good middle-term investment. Good luck, -- Antonio Carlos PADOAN JUNIOR GPG fingerprint: 243F 237F 2DD3 4DCA 4EA3 1341 2481 90F9 B421 A6C9