The issue I have with that type of approach, is that you are placing a value on peoples input - which is fine in theory, but we all know people who have “organised” activities and let others do most of the work. Conversely, I’ve been on activities where staff members have tipped up to help out, and been invaluable, but have no official position on the paperwork.
It’s also really tough to add a value to the staff members who are just around, and may take on a lot of the pastoral stuff, without having a named role.
To make it fairer, perhaps we could have two tiers:
Tier one: A participation allowance for staff only courses.
Tier two: A supervision allowance for events that have cadets on. It could be the attendance allowance, plus an extra amount to take into account the extra responsibilities the staff on such events will take on (even if they do not occupy specific roles).
If you’re feeling generous, we could add a bonus percentage to those staff who hold a higher responsibility post - OCs, WSOs, etc.