One of these days, I may figure it out with a concerted effort – but modding has never really been my thing, so that is unlikely. Hearts of Iron IV has what looks like the most accessible modding tools I have seen – but that still does not stop me from failing to use it completely. But the truth be told, I’m better at rapidly writing walls of text than typing very specific snippets of code. On a select few times, I’ve tried to learn how to mod. When I’m playing games, I often get a great idea for mod.
I’ve included links and notes in bold with any relevant entries. If you want to skip right to the action, that is, the mod ideas I have, then just use CTRL +F and search for “1.” Also, some of the mods here I have since learned how and then made into mods.