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I'll be quick to shift away from the ongoing work being done, and get back to the basics. You want the policy to be designed according to certain core principles, pertaining to a certain philosophy or group of philosophies you believe in following, for the purpose of effective work completion.
Some good points have been discussed in the forum, like the game theory angle. it shows possibility...
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/*/I'll just give you the complete picture of my design and if required, inquire to understand its depth./*/
You have to ensure conformance of project with your vision so you have to be deeply involved in the discussion regarding the plan.
It is at this time you pick a manager who understands the project, (first let's talk about you picking one manager):
The manager starts building his team by handing out tokens for work, you release the no. of tokens according to the work you have seen 20% reserved for the manager. Referals get paid too.
Now, there is a stack of tokens left with the manager. The team working in the project can pull tokens from the manager to to team mates only.
This stack of tokens is exchanged by you at the final evaluation, At the final evaluation you happily exchange for 100% of bounty at 100% customer satisfaction and accordingly.
You have now motivated everyone for the common purpose and created an environment appreciative of team work.
Certain projects shall demand intermediate evaluation, manager should be chosen wisely and should remain on top of the execution else someone who is better suited to requirement should be pulled in, for this position.
Smart managers would consult, from those who better feel your requirements & needs.
For any queries just ask.