Re: widescreen - I've not noticed any problems. Even if they do fail to send the relevant code, you could still change the TV setting manually if need be.
As for marcrovision, I'm not sure. I do find that to watch content on C1 on the main TV I have to set it to RGB out only to stop a shake, but then set it to RGB+RF to watch in bedroom (via digisender)... it's a bit of a pain, but only takes a few seconds to change via channel 999. C1 content is then perfectly viewable - haven't watched any films via it tho so unsure.