I think it all depends on where you're standing. For me, I wish Romney would release more details on his tax plan. I mean, I'd never vote for the guy to start with, but I'd at least like to be able to see what kind of vision he has for taxation going forwards if he manages to get elected.
I imagine that you could simply read Adam Smith and Milton Friedman and come to a pretty good idea of what Romney believes about taxes and economics. But, Smith and Friedman never lay out specific tax plans and codes for governments to adopt; they lay out principles that must be adhered to in order to maintain a healthy economy.
Basically, I imagine that you can take Romney's principles to be somewhat as follows (and, yes, there will be exceptions...read defense spending and medicare):
1. As a government do not spend more than you take in; if you must, do so at a low interest rate and do your best to leverage the debt. Do not borrow to pay off previous borrowing.
2. The more individuals that are paying taxes, the higher sustainable revenues will be. Sustainable is the key word here. The system must be self-sufficient and you cannot do that by simply imposing exorbitant taxes on the wealthy (their money will search for less costly systems and find a way to leave your system). Further, in order to ensure that more individuals are paying taxes you must ensure that more individuals have jobs; specifically, jobs in which they are not getting paid with tax money (else, it is simply circular, which is not sustainable).
3. Revenue collection must be fair. If revenue collection is not fair, it will breed resentment. Resentment, being a powerful emotion, often overcomes reason and individuals will place their money elsewhere, even at a greater cost to them, rather than give it to the system that is treating them unfairly.
4. Spending must not only be for effective and efficient programs, but these programs also appear to be, on the surface, effective and efficient. Individuals do not like to have their money taken from them for programs they view as useless and/or ill-managed. Doing so breeds resentment. See (3).
These systems can obviously be neglected in certain circumstances. The two most obvious circumstances are (1) places in which there exists no relative scarcity of a major commodity (UAE, Kuwait, Saudi, etc.); and, (2) nations which are ruled under a highly repressive and authoritarian government that is very effective at coercion.