1.) I think you stress too much about this one. None of our photos had a date on them and they were all printed from a photo studio about a month before I sent everything, so the only date there was the date it was printed. Heh. I wrote the date for when it was taken on the back of each photo - for most (except for wedding pictures), I didn't know the exact date and just wrote the month and year. And it was good enough.
2.) I didn't bother with that, I just included regular copies. If you have any boarding passes saved, those would probably help too.
3.) Because that's just not how they do it I'm afraid.
For Mississauga, there's nothing to worry about. You can log in to e-cas and you will see when they will begin processing the application. When a decision is made, you will see that. You can then call the call center and they will tell you if you were approved or not.
http://immipedia.ca/CIC_call_centreThey can't give you any information after the application is forwarded to the visa office though.