Two nice to have from me, although I doubt desirable to the project, is always emitting the dstnat/srcnat chains even if no rules are present, and bringing back the user rules chains.
This makes the firewall a bit uglier with lots of empty chains but it does make things more clear for an idiot like me.
I know the advice is to make my own chains with priority-1 however this causes weird interactions with verdicts.
No this is not (easily) implementable via the rule pre/post-pend options as I then have to dynamically find all the chains, zones, devices etc.
Don’t know if it meets what you were looking for to add to the list.
Both options are defaulted off and available via firewall.defaults options always_emit_nat_zones and emit_user_rule_chains