I would say permissions, just because at least the API for it needs to be done really early (and integrated into core) so that all the plugins adopt it instead of checking for OP or start doing their own thing. Ideally, there shouldn’t even be an isOP()
API call.
What would be on the top of my list at the moment would be a permissions plugin. But the other anti-grief plugins would also be important too, WG, WE, and LWC.
I don’t really want to repeat what happened with bukkit when it first came out, were there was no perms plugin.
I would just like to point out the fact that this should be in the porting section and there is also a very comprehensive list found HERE
Author of LWC is missing, so i will port LWC first. Also i want to add new things like:
-break the chest with protection without to drop items
-acces to see chest items, but no acces to take items
-protection for repeater/comparator
-acces to chest/other protection for a limited time/interval time (8:00 AM - 12:00 AM to be able to open it)
-automatic private remove (good if you have a house for beginner players, and you want to give them acces only for 1-2days
-protection for new doors
Other ideas ?
- protection for portals maybe?
- hopper, dropper if they arent added