SirEmi, what do you mean with this: "Pledge QP price for item rewards will double 7 days after the project is completed."?
And how can we add new projects?
After the project is completed and 7 days pass, the special modules attached to a project will double in price and will either be placed in a list of things to get with QP or remain in the completed project reward items list.
So the reward items are an incentive for people to support a project, but the item will still be available to purchase with QP after the project completion, just at a higher cost.
Of course this will not affect pledges that where already placed, so you can always have it delivered after the project is complete or long after as long as the pledge was placed during development.
To add new projects, you'll have to suggest it in the Suggestions section of the forum. After the project is discussed in detail and has some community support, it will be added to the list in the game by a developer. You can suggest projects as well as reward items like modules, optimizations, unique ships, stations etc etc.