I am not aware of any "output routing" capability. I think that the phono outputs carry exactly the same signal as that which appears from the jack outputs, except that the phono outputs are unattenuated.
There is no problem using the jack and phono outputs simultaneously.
Theoretically, because the phono outputs come from a point "earlier" in the audio chain than the signal emerging from the jack sockets, then the phono signal to be slightly higher quality than that output by the jacks. I don't know whether this is noticeable in the real world, I'm afraid.
[This message has been edited by MacAllcock (edited 01-07-2005).]
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John Allcock