Generally speaking if I see something like this:
Action 1 - 6
Action 2 (Willpower) - 4
Action 2 - 3
I'll take the non-Willpower version of Action 2, unless it'd take all our Willpower. The reasoning here is that the majority of voters on these popular options have opted for no Willpower (which can be important - a plan might want to save Willpower for the weekend), but the majority have also opted for Action 2.
Conversely, if I see something like this:
Action 1 (Willpower) - 6
Action 2 (Willpower) - 3
Action 2 - 4
We're more likely to go with Action 2(Willpower), as the thread was going to spend a Willpower point either way and the vote was pretty close.
Lastly, if we see something like this:
Action 1 (Willpower) - 6
Action 2 (Willpower) - 1
Action 2 - 6
Despite the thread voting for Willpower over all, it's pretty clear the vast majority of voters for Action 2 don't want to use the Willpower point on that Action. While Willpower gives a buff to an Action, it can also sometimes leave Ulos open to worse consequences (for instance using Willpower to try and learn about somehow gets better results, but seems kinda creepy).
TL;DR - Don't worry about splitting votes between Willpower and non-Willpower versions of Actions. They'll be summed. If the vote is pretty close between the two I'll use other factors to decide whether we use the point or not. If it's not, we'll go with the vast majority.