Port for Drupal 6 ?

the Masquerade module is so useful. Now I am going to Drupal 6, but cannot live without this great module.

So how about porting it to 6?

[BTW: when trying to see what "project information" I should put here, what is Version HEAD? I see it many times, but have only guesses. Is it whatever at the top of the version control? How do I see what's there?]]

THANKS!!