Why does Koan exit with "Kernel options are too long, 255 chars exceeded"?

Issue

In the new RHNS server the kickstart URL has become much longer then the original. This brought to light a practical problem:

For isolinux the maximum length of any pathname is 255 characters. The new kickstart URL is about 85 to 95 characters. Our kickstart w.o.w. uses static ip addresses which adds about 99 characters to that line. This leaves about 61 to 71 characters to mention boot kernel, initrd file, apci settings, ramdisk size etc. etc..

From time to time installations fail on this because the line simply gets chomped.

A common isolinux.cfg would look like this:

default local
prompt 1
timeout 600
display boot.msg

label local
   localboot 1

label example01
   kernel vmlinuz
   append initrd=initrd.img ramdisk_size=131072 acpi=off  ks=http://rhns.example.com/cblr/svc/op/ks/profile/rhel5u5-x86_64:1:EXAMPLE-COM   ip=192.168.127.127 netmask=255.255.255.0 gateway=192.168.127.1  dns=192.168.100.55 host=example01 dc=sbl01 type=apc nokill nousbstorage  ksdevice=eth0

The actual string will be chomped at character 255 e.g.:
vmlinuz initrd=initrd.img ramdisk_size=131072 acpi=off  ks=http://rhns.example.com/cblr/svc/op/ks/profile/rhel5u5-x86_64:1:EXAMPLE-COM   ip=192.168.127.127 netmask=255.255.255.0 gateway=192.168.127.1  dns=192.168.100.55 host=example01 dc=sbl01 type

So we "lose":
"=apc nokill nousbstorage ksdevice=eth0"

So we "lose":
"=apc nokill nousbstorage ksdevice=eth0"

Is there a workaround for this problem?