Yes of course you can. Set a one bar offset in the Project Setup menu. Then you can put your cursor at bar 0, Set Timecode to cursor and then type 0 in the dialogue box.
Personally if you were going to do this, I would probably use a 2 bar offset, so that there was a bit of room at the start of the project.
However, I sort of agree that it would make more sense to set the Timecode to something like 10:00:00:00 at bar 1, than to set it at zero, because the first bar of music would normally be at bar 1. However, I also sometimes put the click count in at bar 1, so that the fist bar of music is at bar 2. Many ways to skin this particular cat.
If you want to lock a particular bar (or beat, for that matter) to Timecode, this can be done using Warp, but there are some caveats, so I don't really want to get into it until I know more about what you're really after.
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