I think onload category should be based purely on years of service. I don't see why a person that's been there a year should get on before someone with 20 years service just because they use an "annual leave trip".
I agree, it would be good to know your ranking in the stand-by list too.
And has anyone noticed the availability on the staff travel website doesn't show by how much a flight is over booked. It used to read into the negatives which is handy when choosing between 2 heavily booked flights when stuck somewhere.