Since I'm running out of clues and have busy days ahead, I would like to terminate this round. Please, could somebody else take over for the next round? First come, first serve...
The solution is "Renaissance Man"
Clue 1: Once is enough - Janeways facial expression indicates she wouldn't really appreciate more away trips with the Doctor
Clue 2: Not the intended use - The morgue chambers are used to hide crew members who are - of course - still alive
Clue 3: Now is not the right time - Janeway postpones the discussion about socializing with the Doctor
Clue 4: Being outdated could be revealing - Torres' holographic template is updated to show her pregnancy
Clue 5: A fabricated superpower - The story about the highly advanced R'Kaal Empire
Clue 6: A physician of many talents - Doc flying a shuttle, singing, taking holo images and writing a paper. Also a reference to the episode title