Add "name" input option for anonymous write-in choice

The site I'm working on has only anonymous voting on binary polls, and has the option for anon users to add a write-in vote. I'm wanting to include the (anonymous) user's name along with the vote, so the poll will read:

x Choice 1
x Choice 2
x Choice 3
x Choice 4 other (user specifies)
x Choice 5 (write-in by Joe Blow)
x Choice 6 (write-in by Jane Doe)

It seems like the way to do this would be to have an additional box that appears along with the write-in box on the poll form, and then add a column "choice_creator" to the advpoll_choices table. Then alter the _advpoll_writeins_voting_form_submit() function to save this new field to the new table column.

Any thoughts about how best to do this? How about making this an optional setting? Sound familiar? Any related issues I should refer to? I'll gladly share any code I modify.