A more fine-grained approach to permission would be nice:

- allow members to be able to assign or be assigned tickets would be very useful

Right now Everyone submitting tickets can directly assign them to some stranger. Using the text field makes it less convenient for a group manager to assign tickets after sorting.

- allow/dis-allow users when reporting a ticket to set only certain fields (like priority but nor status, like immediately to fixed/closed)

- allow custom fields to be required for new tickets