I've been working on updating the Papyrus autocomplete XML file for Notepad++. I uploaded a new version to the CK Wiki earlier today. I've done my best to find and add missing events and functions, most of which were added by official CK patches but also those added so far (version 1.6.6) by SKSE. There might still be some missing events and functions, but I hope there aren't many.

Adding descriptions and arguments is the next goal as they are absent from most functions and events. I'll continue updating, but it'll probably be a slow process due to work related stuff. I'd like to ask people for help so that this can be finished sometime during this decade. If you intend to help, then it would probably be a good idea to reserve a certain range of functions (e.g. all the functions starting with Get, Has or Is) in a post. That should minimize, or even eliminate, people doing the same work.