If you use the paste from word button to paste a block of text it pastes outside the editor and messes the page up. I have to use the CE on a page that pops up in a modal dialog, and return the text to the parent page using client scripting.
I created a host of custom functions for the CE3 which we used so far, but I am not sure what's the way to go about creating custom functions in CE4.

If you keep applying styles to a block of text it keeps adding SPAN tags, although it should be just one span tag in the end, which I corrected to some extent by modifying the JavaScript in CE3, which was very straight forward. I would like it if i can use CE4, WITH my existing javascript functions. Whats the best way to do this?