Be aware that this involves doing things as root and so may get your deivce into a situation where you have to reflash, or enable R&D mode to correct problems manually.

1. Install a text editor such as vim, QEmac, nano or Leafpad.
2. Install rootsh from Extras.
3. Open the file /opt/catorise/menu in that editor. For example, in X Terminal: vim /opt/catorise/menu
4. Each desktop file name is on a line of its own followed by the category in which you can place it. The valid values for the right-hand side are those defined in the Maemo 5 Developer Guide and _root.
5. After editing the file, open X Terminal and run:

Do you man "miscategorised" or do you mean "didn't put them where I wanted". The former would be a bug (which I'd like to have reported), as Catorise just puts things where the application developer/packager decided (corresponding to bothe the Application Manager and maemo.org/downloads/ sections).