No plans to do that at the moment, though I can see why you want to do this.
If you want to do this yourself, modify the code that builds the indices so it draws the opposite way. This is from tk2d 2.0, but there is similar code in tk2d 1.0. More or less something like this.
for (int i = 0; i < data.maxChars; ++i)
{
int j = (data.maxChars - 1 - i);
indices[offset + i * 6 + 0] = vStart + j * 4 + 0;
indices[offset + i * 6 + 1] = vStart + j * 4 + 1;
indices[offset + i * 6 + 2] = vStart + j * 4 + 3;
indices[offset + i * 6 + 3] = vStart + j * 4 + 2;
indices[offset + i * 6 + 4] = vStart + j * 4 + 0;
indices[offset + i * 6 + 5] = vStart + j * 4 + 3;
}