Right now you add new controls to "Custom" so I have to go into the config and move things around...it'd be nice to get that option in the UI
1) Where you want it to go
2) If you EVEN want it to appear in the config (sometimes I'm making controls for templates, and forget to remove them from "Custom"
I exclusively use thunder, that's what I mean
There's no asking, it always throws it into "Custom" in the toolbox where it SHOULD ask me where or if I even want to register it there (again, I might not...might just be a widget to place on a template with markup)
If you right click the folder and click "Add new item" it will add it to the specified folder and not custom. If you're adding it from File > New > File it will go into custom but that's better than going into the root of the project like other project types. Being a visual studio extension there's only so much control we have over that. If you want your widgets in a specific folder right click that folder and add the file from there. As far as registering in the toolbox.config creating it as a regular .ascx file, you can use Thunder to register it wherever you'd like in the config.