Possible options that don’t involve having to adjust the poll feature…
1) yes/no poll added to each entry. Ties are highly likely this way, however a more traditional poll could be conducted after the first weeding-out round clears out entries that the voters don’t adequately support.
2) two divisions of 11, top 6 in each go on. Deciding how to break them up could be tricky though.
3) preliminary polls for multiple-entry authors to bring the total under 12. this kinda goes against the original rules though.
4) post votes in a thread. loss of anonymity and added bookkeeping need to be considered, though.
5) email votes to you direct. Big pain in your butt this way to keep things straight, and even harder to avoid multiple vote abuse. Also potentially opens up claims of bias.