Widgets are just a special kind of plugin. You can use meta.settings.get in widgets if you want, but only if you have a setting that is shared across all widget instances.
I'm not sure what you mean by using meta.config but I don't see anything wrong with it.
As the title suggest, I am trying to allow my users to upload documents on the forum. Are there any plugins to do so, or is this something I will have to implement myself? Thanks for your patience.
You could allow local uploading and specify a file size, go to Settings > Post > Tick Allow Users to Upload Regular Files, then adjust the file size from the default 2mb to whatever you feel you need.
This will give you a new icon on the composer. I've just tested it with a pdf and it works fine.
