Found a very easy way to make calls without looking down... unfortunately it makes making a call a little too easy! I'm using Go Launcher EX, so not sure if it's a stock option or not. You can set "swipe up" and "swipe down" as pretty much anything you want so I used it to setup a direct dial. It works really well, but it's super sensitive so I find myself dialing the two numbers I set up all the time so I don't think it's going to work for me.