yeah it is possible. Lets say we have the following select element:
<select name="test" id="select">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
You get the current selected option by using getValue and you can change the selection by using click. Here is an simple example:
var webdriverjs = require('webdriverjs'),
client = webdriverjs.remote({desiredCapabilities:{browserName:'phantomjs'}}).init();
client
.url('http://localhost:8080')
.getValue('#select',function(err,val){
console.log(val); // will output "1"
})
.click('//*[@id="select"]/option[3]')
.getValue('#select',function(err,val){
console.log(val); // will output "3"
})
.end();
Hope that helps.
cheers