And while your at it, if possible at all, to have a question and then instead of options, a text box that the participant can write their answer in for more specific answers (Like instead of "What times do you normally play a day?" with 5 different answers to select from, the person can be very specific).
This is "Tests", not a Poll, where can be additional custom text-fields for any text. Each answer has Points, which are summed up on test finish, so it is impossible to add custom fields.
Imagine such test...
Do you like me?
Yes - 1 point
No - 0 point
Custom (man wrote: I like you, but you are an asshole) - so how much points this answer should have?
The first part of your message gets the answer - There is no such feature