Hopefully there are still some lurkers yearning to post out here besides buzz and penn. If so, how would you define the role of government if could create the framework for one on the scale of the U.S.? Here's my take:
1. All laws should be centered around the right to free will. No law should be made restricting a given activity unless that activity impairs someone else's ability to exercise their free will, limits one's own ability to exercise free will (i.e. mind altering drugs or mental illness), or garners near unanimous support on the order of 80%.
2. Basic rights should include free will, a minimum standard of healthcare, and a certain level of privacy.
3. The federal government should only make laws or expend funds which benefit multiple states or have near unanimous support. Federal funds should not be directed to intrastate projects such as a bike trail in city XYZ. The same holds true for state funds where they should not pay for intra-county projects unless they have near unanimous support (i.e. rebuilding after a natural disaster).
4. Taxes should be based on what is taken from society (consumption) and not what is put into it (labor). A VAT tax which is generally applied as a fixed rate to all new goods with a fixed dollar amount refund would be ideal. Different rates could be applied to different consumables in order to encourage or discourage them (i.e. solar panels or cigarettes) but this should require near unanimous support on a recurring basis.
5. We should participate in an enforceable world government with a similar structure as our own. A United Nations with a peacekeeping military, criminal justice laws and courts, extradition, and currency which would be modeled after this framework to only deal with international issues and not intra-national ones and centers around the basic right to free will.
6. Legislative representatives for one of the bicameral houses at the state, national, and international levels would be selected by compulsatory sortition from the voting population while the remaining house is directly elected.
That's a start. What would you add or remove? Or feel free to write up your own from scratch.