tapewrite is missing option to write tapefiles with differing blocksizes

[vaxorcist]

I conclude from:

tapewrite [-v] [-s] [-n blocksize] outfile.tap infile1 [infile2 ...]

that tapewrite cannot write tapefiles with differing blocksizes.

Could you please add this feature using e.g. this syntax (or similar)?

tapewrite [-v] [-s] [-n blocksize] outfile.tap infile1[:blocksize] [infile2[:blocksize] ...]

In case that this feature is already present, please share the syntax.

Thanks!