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Richard:
You're correct about this, and having a WYSIWYG editor usually converts a thin module into an obese one. Take, for instance, Tiny Content. Without the editor, it's less than 100 kb. With the editor it grows to more than 1.5 Mb. I can tell you that in TC I disabled the WYSIWYG editor because also want a lean interface.
Another thing I do sometimes is to hack the XOOPS files so that instead of using the form structure that lets you include smilies, images and such, I use the simpler one. How? Well, instead of using XoopsFormDhtmlTextArea I use XoopsFormTextArea.
Cheers.