If there is only one OS on the machine (and we assume Puppy!) the grub loader has no need to be set with a timeout any higher than 0. If the install script is capable of detecting other OS's and building a boot menu it should also be capable of detecting no other OS and setting timeout to zero. Hopefully.

This is referenced several times a month on the forums from new users confused as to why they appear to be given a choice of OS when there is only one OS.

This would prevent users from being able to enter boot time options such as pfix=ram etc...