Well clearly that is your choice - and your choice alone.

Out of interest DID you vote in the last election?

As posted you do not need to vote for 5 candidates.

If there were 2 candidates you were comfortable voting for - as you say, one assumes they might be the obvious ones to select? You can quite legally vote for just those two.

Flyertalk, like every election I have ever been involved in, allows you to vote for the Candidates(s) you want to be elected, not to choose the ones you do not.

Perhaps your novel idea may catch on. However I suspect George B. Bush hopes it does not.