I would like the ability to choose whether or not subplots, natures, goals, and assets. Will have a positive or negative effect (or maybe even a neutral effect) That would be extremely useful int eh long run. (And possibly the ability to let players start with more than one strength/weakness card would also be awesome)

Agreed. One of my players recently played an asset card on a challenge and completed it with an uncertain outcome. That card was given to him as the idea that it was a strength. He was giving a gift to an NPC, and that NPC needed to be made fond of a party member in order for an event to occur.

I am writing the outcome as such, however I feel my player would have felt much more accomplished to see that green link icon get slapped onto the obstacle.

Allow narrators to give assets/goal cards a strength or weakness status so they do not always have neutral designations.

Also, in certain contexts, a weakness may play out as a strength, and vice versa. For example, poor health gets one out of an undesirable situation ("get him out of here...I don't want to catch that.")

It's important to remember that the outcome guidelines are just that--guidelines...Just because the system says "strong outcome" doesn't mean that you have to write it that way, if it makes better sense otherwise.

The narrator can always play. The narrator sets scenes, plays challenges, lays out cards to pick up, gives cards, and ends scenes. When the narrator plays a challenge, she sets guidelines for a strong and a weak outcome. The narrator already has TONS of inputs to the game.

To me, playing cards to result in an uncertain outcome is roughly equivalent to saying "I don't care what happens here; you pick." Which seems lazy.

What the non-Strength/Weakness cards do is give the narrator a chance to play. You need a good amount of uncertain outcomes for the narrator to get control once in a while.

I had an earlier suggestion that your Nature card would be a permanent either Strength or Weakness. (Sometimes, it's good to be a werewolf. Sometimes not so much.)

I think a neutral card just steps the game closer to moving past the obstacle. If you were playing more competively, it's a way to shut out other players from shifting the story in an outcome you like. Kind of.

Maybe the player flags the card as what they'd like to use it for and the narrator can agree or kick it to neutral?