Bukkit

What is the enhancement in mind? How should it look and feel?
add functionality for iron_doors, iron_trapdoors to be opened by svs with player_interact_event

Please provide any additional information below.
if block = irondoor/trapdoor
then (insert svs settings/commands/etc) set block state powered/unpowered

Tip: try decomplieling LWC for this. it already has this ability. (toggleable via config file)

We'll add this - the question is how best to implement it.

I'm thinking a config option that can be set to true/false - if true, then players can open/close an iron door/trapdoor upon successful event trigger (i.e. the event is cancelled before).

I don't see much use of a per-sign option, it's just more clutter and disk space for each sign file.

Feature already added since 4.2.
You can see how to use it here : https://serversigns.de/wiki/Command_Reference