Those at the far ends of the political spectrum may not agree that improving the efficiency and efficacy of the liberal democracies LWers tend to live in is a good thing. If you want the US government to fall because it is irretrievably co-opted either by the class interests of a wealthy elite or a pseudo-Christian cult of power-mad propagandists run wild then competent technocratic management is probably contrary to your goals. If you're against government you might want them to be bad at it.
Other areas I would suggest: IP reform, tax code simplicity, science curricula and corporate subsidies. Really, there are tons of things progressives, neoliberals, leftists and libertarians can cooperate on. That part isn't hard. I would guess it is the reactionaries you'd have trouble accommodating. I look forward to seeing if they think this is plausible.
Other areas I would suggest: IP reform,
Different people will have different opinion on the issue. Some want a abolishment of patents while others don't.
tax code simplicity,
That's a very difficult topic. There are a lot of people who pretend to want tax code simplicity but at the same time do favor specific tax deductions.
science curricula
I would guess that there are a fair number of people who oppose the idea of curricula.
corporate subsidies.
It's very difficult to outmatch a corporation who lobbies for their own subsidies.
I was thinking about the hazards of bad government, and wondering if there was a way for the LW community to do something to oppose them, and it occurred to me that we might be picking up the problem by the wrong end.
The usual way of thinking about political action is to start with one's political identity (progressive, libertarian, whatever), and that's likely to put one at odds with people who have opposed identities.
Instead, I believe there are projects which could appeal to rationalists across a wide range of the political spectrum. A couple I can think of are opposing the war on drugs and improving judicial systems. Any other suggestions?