Cannot set First Measure Number to zero

[Tim Mariott]

So now that I have updated both of my machines to Composer 3 and ditched Composer 2 to avoid confusion, I am faced with this problem again.

Just working on a purchased choral piece which starts with measure 0 (zero) and I have to produce a piano reduction for our accompanist which has ended up with different measure numbers to those showing in the original printed score. Bound to cause a certain amount of confusion between our conductor and our accompanist.

Is this anywhere on a reuqested features list or should I assume it is a permanent constraint of Composer that I cannot have a measure zero?

Thanks
Tim