Hi Eric,
We can add a setting in .sfmarkup for that fairly easily, I think.
ckEditor being forced was an intentional decision a few years ago but I don't remember why. I think it was due to how the controls are added or something like that. We'll look at it again and see what we can do. To be honest, we'd like to implement a different wysiwyg altogether. It only takes time. lol...
Thanks,
Joe