This poll feature is just a small app that looks for specific custom_json operations, and shouldn't require active key.
The operation (given you vote for option 1) should look something like this:
{
"type": "custom_json_operation",
"value": {
"id": "polls",
"json": "{\"poll\":\"acidyo/what-are-your-expectations-of-hive-witnesses\",\"action\":\"vote\",\"choices\":[1]}",
"required_auths": [],
"required_posting_auths": [
"gtg"
]
}
}
I don't know how it would handle multiple choices, i.e. [1,2,3,4,5,6,7]
.