It'd be nice to latch into the camera without a firmware flash. If you haven't seen or heard of CHDK for Canon P&S cameras check it out
here. They've taken some P&S cameras and add some great features for them. Some of them I am envious of (DOF calculator, live three color histogram with highlight/dark warning areas flashing again while live, raw in a pocket camera supporting DNG, bracketing by Tv or Av only, scripting, games, text reader, etc). The best part is that it didn't require a firmware flash - it's loaded off the SD card when it's turned on. I'm sure it's got to be possible.