Hi Chaosmoon,
Simply select the appropriate minor key signature in the Score's toolbox and your raised seventh scale degree will be recognized as such and reflected in your notation (spelled as a leading tone).
If you instead choose your minor keys relative Major key signature your raised seventh will be recognized as an enharmonic equivalent of the leading tone and spelled as a flat tonic. All of your other chromatic harmony (secondary dominants, Neapolitans, Augmented 6ths, Linear diminished, etc.) will have to be adjusted in order to be spelled correctly.
Hint: "Flats to Sharps" and "Sharps to Flats" key commands can really speed up the workflow.
Having a passion for highly contrapuntal music I do all of my writing on paper and then later transfer it into Logics score.
George Bellas
Dual 2GHz G5, Apogee Rosetta 800, RME 9652, Focusrite Red Series Mic Pre, HR824's Mac OS X (10.4.5)