help adding some features to 5.1

[Ananth Chellappa]

Hi Team,
       Could I get some help locating portions of the code that would need
to be tweaked to add these features?

If I had the time, I would love to get to know the code, but I have too
much going on in my real job.

1. Intelligent support for !$ (and related - like !2$, !-N, etc) : This
means - ignore the & at the end of the previous command.
2. Autocomplete for !$ (and related tokens) : This means - if I have typed
!$ and now press TAB, I want the last word from the previous command
substituted on the command-line immediately.

Thanks sincerely,
Ananth