Absolutely, get a squirrel feeder!! Every morning, religiously for about a year now, I toss about 3 cups of bird seed, a bowl of peanuts in the shell and sometimes a 12oz bag of raw out-of-the-shell sunflower seeds onto my patio. I just scatter it all on the floor of my stone patio.
I get ALL the birds, squirrels and rats. They've all figured out their pecking order. It's fantastic to watch. My desk, as I sit and type this or do any work, looks out at them.
There is a nice balance. I guess some people would get freaked out by the rats, but I don't. They are out there, they are not going away. Their population stays in check with other creatures. There aren't too many.
We recently added a fountain with a pump for the water.