Phil,
I noticed something about using the fckeditor on the system, if you use the editor on all the language variable boxes, which does slow down the load considerably, it encloses plain text in either <p>, <div>, or <br> so this can have some ill effects. Take for example you open the languages page and select your language, it loads the page and diplays the first x number of variables. Now since fckeditor starts in wysiwyg mode, you don't notice that it has enclsoed all of the plain text in the first x variables inside tags. Now if you just edit one of those first variables and go to the bottom and click update all (why isnt it update selected anyway?) it has now updated all of the first x variables with the tags. So then if in your css you have the base <div>, <p>, or <br> tags with any styles on them, those styles now overwrite the styles you might have intended for these variables.
I took a look in the editor config and it doesn't seem to allow you to turn that feature off, just change what it is enclosing them in.
Just thought it was worth noting.
@ashley
you can get it working in the webmaster mode but it takes a lot of finagling to get it not to blank out the text in the textarea, kinda strange behavior.