Re: Add-ons in the Scene Editor?
You have to add their references to Base.rte/Index.ini.
Take a look at the mod's index.ini. In there are a bunch of "IncludeFile = " lines, which are the references I'm speaking of. You have to cut those and put them in Base.rte/index.ini. Needless to say, make backups of both files before doing this.