It would depend on your requirements of course. For example, if you have objects residing in QTEMP that your interactive programs need to access on a regular basis (and your library list is large) you may want to move it to the top – not that it makes much of a difference nowadays with machines being as fast as they are.
I have seen programs that temporarily move QTEMP to the top.
Like I said, depends on your requirements. If there’s no pressing need I would leave it at the bottom.