ANSWER: how to add extra chat options in pppconfig

["Jonathan D. Proulx" <jon@ai.mit.edu>]

Hi,

I accidently deleted the post this answers (oops).

Someone needed to add some more chattiness after connectig to their
ISP to select PPP rather than SLIP or some other things...

After going through the regular set up, it shows what you've selected
for connection settings and allows you to change them if you
mistyped. 

It also has an "Advanced Options" option.  Select this

Then "Post-Login" from the menu it presents.  It explains itself
pretty well.

You can add as many extra expect-send pairs as you need here.

Hope the right person reads this :)
-Jon