No, not correct. It is impossible to load any Oyster product to a staff
pass.
There are other scenarios where mid journey validation could be
necessary. This is why I am joining MIG's campaign for validators on
trains ;-)

My suggestion for TfL would be to use a postpaid solution. Put an
all-zones travelcard on the staff pass but require you to always touch
in and out. Then do some data mining and calculate the appropriate fare.
Deduce it from the pay check.

But that's probably to easy.