It is already possible to add new behaviours for gaining XP, losing HP and gaing GP under class settings, but I think it would be very useful if a mixed behaviour setting could be added that allow teacher to create behaviour that could add/subtract a mix of HP, GP and XP.
This would allow the creation of quick behaviour buttons for use in Random Events that only occur after a child has won or successfully done something quickly. It can also be used for teachers to add their own features so example:
I allow students to trade XP for GP
Or a shop system when they can buy health items (Like a med-pack)
It would allow a variety of useful tricks and tools for a teacher to utilize.