TeX - ! Extra alignment tab has been changed to \cr

[Taylor, P]

I have a suggestion, Carlos.  Why don't you take TeX.web, make the 
changes that you feel are required (to the error message, and to any 
other aspects of TeX that you feel are sub-optimal or unsatisfactory), 
tangle and weave the resulting source code, compile and typeset the 
resulting Pascal and TeX sources, demonstrate to your own satisfaction 
that all is now as it should be, and then publish the results as (e.g.) 
"Carlos' enhanced TeX".  If your work is truly an improvement over 
Knuth's, I am sure that TeX users worldwide will thank you for your 
efforts and adopt your work with great enthusiasm.

Philip Taylor