Here are some things that I think remixer should be able to do.
1. resize and move text boxes
2. add new text boxes in a chord
3. resize chords, especially vertically
4. resize images and move them around on screen
5. needs a real blog feature
6. need to be able to add comments to pages
Maybe I just haven't found these features, but I would have thought that at least the first four would be standard features for anyone designing software like this.