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You shouldn't need to edit anything from xoops-class-xoopseditor to get it to work. If anything, you need to edit files in NewBB2 and Wiwi.
Here's how I do it (assuming that they've got the basic code in there). First, load the latest version of the xoopseditor (1.10 as of this writing). I forget but you may need Frameworks, too, for this (I install both for all my sites).
Next, go to the module page that has the text area on it that you want to use a WYSIWYG editor on. Then go and edit that page and do a search for the call of the editor ('fckeditor' for FCKeditor, 'wysiwyg' for Koivi, etc.). Then edit the paths to make sure they are pointing correctly to the correct path for that editor.
Previously, fckeditor, koivi, spaw, and other WYSIWYG editors that were integrated with 2.0.x were spread out in different places. This xoopseditor framework puts them all in class/xoopseditor/editorname and standardizes it similar to the 2.2.x branch, but many modules still point to the old directories.
If the editors aren't selectable in that module, then more work is required to instantiate the editor and such.
If that isn't enough info, let me know, and I'll dig it up for you better. If that's the case (that these editors aren't integrated to some degree into these modules), at least let me know what specific pages you are trying to get the editor in, and I'll see what I can do for you, but hopefully you'll do a solid try first on this.