Apologies if this topic has been brought up multiple times before, but as someone who has played the previous two games in the series I was hoping that this third iteration would have an option for independent/custom party candidates. Obviously it doesn't, which is a shame.
Of course independent/third party candidates usually end up with around 1% of the vote and thus typically aren't very important, but every now and then they can play a pivotal role. Nader's impressive showing in 1992 is a good example of this, but an even better example is the 1912 election. Teddy Roosevelt, running as the Progressive Party's candidate, came in 2nd place, beating the Republican candidate in the popular and electoral vote.
It would also be fun (and challenging) to create a hypothetical candidate with whatever party you desire.
In short, the game's depth, replay value and historical accuracy would all benefit from the inclusion of independent/third party candidates.