I'm sorry to ask this here but I have spent a lot of time trying to find the answer, to no avail. If there is a list of supported features for this model somewhere, I'm sorry I missed it!
* Is it possible to lock exposure in movie mode?
* Does movie mode work properly in CHDK?
* Does raw stills work properly?
I've been using CHDK with my IXUS 80 for years and I think it's fantastic. Hoping to upgrade. The IXUS 300 is just out of production according to all the stores I've asked, so I'll have to decide on this camera by tomorrow.