Create your new composition with the proper settings(save for how it counts frames) and click "OK". Now in your timeline in the upper left corner you will see the current frame, "Cntl" + click it and it will change to display timecode.
Now when you create a new comp it will default to displaying timecode rather than frame counter.
Johnny Cuevas, Editor
"I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work."
---THOMAS EDISON on inventing the light bulb.