Once you've added the round calculation but before you 'progress' any turns you can set the 0 to be anything you want... I do agree however that being able to set a start value from the same menu that adds the tracker item would be a useful addition, probably fits more in the suggestion forum territory though. Rereading, are you say that when you add the tracker item with a calculation it straight away performs the calculation on it? Again, you can change that value to be whatever you want in the tracker but that is odd if it is doing that to you :/