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gPXE doesn't set the field.

ISC's man page says the option can be used to implement a secondary
DHCP server that is only used if the primary is not responding.  The
secondary only responds to requests if the secs field is larger than a
threshold, giving the primary a chance to respond first.

I believe gPXE already supports a priority DHCP option that could be
used in the same way.  The secondary server should have a lower
priority than the primary, so gPXE chooses the primary when available.

Joshua: I think you know the DHCP code and how priority works.  Any ideas?

Setting the secs field shouldn't be difficult though.

Stefan