If I understand your question, you would like to convert panned video in to a panorama. This is not the sort of think that is easy to do in the camera itself, so unlikely to be a feature of CHDK in the near future, however, you might like to take a look at doing this on your PC. Take a look
here for a tutorial which lets you do things like this...
If, however you are simply trying to create a panorama from a bunch of stills, you might like to try
Hugin which produces some spectacular results.
