Linuxconf should have buttons for each of the ppp options that can be specified (along with a catchall to support new options), with help for each option, so you can easily determine what options to set, without having the NET-3 and/or pppd man page open while running linuxconf. Glancing at the pppd 2.3.5 man page, options that should be setable include: passive, bsdcomp, chap-interval, chap-max-challenge, chap-restart, deflate, demand, domain, holdoff, idle, ipcp-accept-local, ipcp-accept-remote, ipcp-max-failure, ipcp-max-terminate, ipcp-restart, ipparm, all of the ipx options, all of the lcp options, ms-dns, ms-wins, noipdefault, all of the pap options, persist, predictor1, vj-max-slots, welcome.
This is really an enhancement request, not a bug.
This has been assigned to a developer for future enhancement requests.
I disagree with this request. We specifically chose the options that would be useful to the most people to avoid being confusing; the other options are only useful to people who know what they want to do anyway. We are willing to consider adding specific options, but we need a coherent argument why each particular option would have wide use before adding it.