If you read through the CDHK FAQs, somewhere in there is a note from someone quoting a Canon CSR as saying it wouldn’t void the warranty. So, they’re aware of it, and haven’t taken any steps to have that removed…
I’m guessing they’re being passive about it. They don’t want to ‘actively’ support it (though I wish they did – like Linksys does with some of their routers) but they’re not saying ‘don’t do it’ either. I understand that there are a very few cases where a combination of settings can damage the camera – IIRC there was something about certain circumstances where you could try to drive the zoom past the stops and potentially damage the gearing – but I think it’s a safe bet that they service a lot more returns for general stupidity (the “it quit working all of a sudden but I’m not going to tell you I dropped it” ones) than they’d ever see from those instances, or just from someone using CDHK in general.
And besides, they allow users to do firmware upgrades. That’s far, far more risky than someone running a layer of software on top.
