Agressive Update Notification does not disable the update notifications! Just makes them non-aggressive... That is, instead of annoying you the right second a new version is released it annoys you only if the new version is two weeks old or if a new major version was released but it still annoys you! So you cant really disable it in the configs! You can use the "checker" command to disable the checking of a specific mod but... it doenst disable checking for updates for that mod. It disables warnings for that version of that mod. If Reika releases a new version for the mod you disabled the checker, you get a new warning and need to disable it again. So... yeah... not possible to disable the warnings. And dont even tell me its a WIP feature. If it is, it should not be released to the public since its annoying. Only he and his acolytes dont realise how stupid and annoying it is!! On a real life work, people get fired for way less.
Dont feel bad for not knowing since its not your fault since there is not documentation about this and the update notification setting is not even on each mod config file as is a common practice. Its on the DragonAPI config file... And.... it doenst work.
Again, Reika made something different because he thinks his way his better(tip: its not), doesnt give any official documentation about a system that would annoy people(what I know comes from Reika replys on reddit) and doesnt give a f**c about the others opinions. And if the first two are the reason why there is a shitstorm on reddit at the moment, the last one is why he his not loved by pack makers. He creates/balances his mods in the context of being the only mods in the game and forces players to play the way he envisions the game. The thing is, his mods are not the only ones and he doesnt allow tweaking so they can be properly balanced for a themed pack. And its a sandbox game, mods are suppose to give content to the game, not to restrict game mechanics and game style to what he thinks his the right way of playing. If I want to tweak/change recipe/disable something in his mod, I should be able to. The days of kitchen sink unbalanced mod packs are gone. Monster packs and like that are gone since now you dont have ID conflicts and all the nightmares it come from them. You want your unbalanced pack, you just make it yourself. Now is the time of HQM/MineTweaker, where packs have a theme, a lore, a story, mods are balanced to work together and give a progression that fits the pack, not the mod. If your mod does not evolve to this new way of moding, it will be left out in the shelf! And that is one of the reasons you dont see many Reika mods in packs.
Let the Reika acolytes come with the pitch forks....