**API Only:**
We limit AWS IPs to our API only. This is because historically we had a lot of abuse from AWS and it last time I checked AWS doesn't have a static IP only block -- therefore it is easy for AWS users to morph IPs.
**Cookie Snatching:**
In theory it is possible for someone to snatch your cookie and impersonate you. As far as I know this has never happened, and we could reverse any damage they did.
**SSL:**
There is a lot of work around SSL for us. As of now, we don't have a set date for full SSL support, or if it is even something we will work towards.
When it comes to one IP per site, we would be okay with a SAN cert (multidomain cert), but because of the way wildcard certs work we would probably need to change the naming meta scheme so we could just have *.stackexchange.com wildcard cert.