I think that scale should come into it. Blitz represents coordinate systems as matrixes, and scale can be and probably is stored in the matrix. So, logically the Tform commands would grab the matrixes of the source and destination and divide/multiply the vector by them. Blitz would have to normalise each axis of the matrix for every TForm command, slowing it down signifigantly. And anyway, incorperating scaling allows you to find global vertex positions etc.
Oh, and if you think it should be specified in the docs, add a comment to the Tform commands in the special docs section of the forums.
Oh, and if you think it should be specified in the docs, add a comment to the Tform commands in the special docs section of the forums.