It's impossible to increase the PPP timeout connection created by linuxconf in /etc/sysconfig/network-scripts/chat-ppp0 to something sensible - I had to manually edit this file and make sure never to run the PPP customisation section of linuxconf/netconf again, because it would just remove my increased timeout, and establishing a connection with my dialin always takes longer than 15 seconds
Changing the value in "No Connection" timeout does not alter the script generated in /etc/sysconfig/network-scripts/chat-ppp0. It is always "5" no matter what you enter.
Added Jacques to CC line
Reported fixed in linuxconf-1.16r1.3, released as update RHEA-1999:026