SOCOM-Bill, Keklas, Employee2-4601, others..
Traveller's history of the UWP/UPP digit system has caused more discussions & arguments than previous historical eras of "how many angels can dance on the head of a pin?"
Answer: 'As many as they want to'.
SOCOM--the suggestions by all of of the above (and myself) are akin to my own. LL means now more than just "gun-ownership". The early free-wheeling days of CT where players ran into trouble with planetary law more often than not, this was a streamlined simplistic solution f that particular variant of our fav game system.
It represents personal freedoms, taxation, etc, etc.. Like Bill says, make that digit work for you--not you for that single digit.
I would add from my personal TU, the practice tweak of using that darn digit as a tax/monetary exchange modifier (for thems with mercantile aspirations). LL is also applied/ adjusted by the planetary government digit in world creation as well. Amount of interstellar trade is modified by starport type, as a general rule of thumb. Keep the gun ownership as is in LL interpretation, as its already been done to death. Like wise the current LL's also state which levels carry police-state intrusiveness (C+)
The level of complexity for your TU is of course, yours to command, and detail to the players.
The general formulae
LL = Exchange level by 5% increments beginning at Low Law Level 1.
example: LL-6 = a base 30% taxation rate for monetary exchange. Meaning if local currency is needed, and the offworld folks (your players!) have Imperial creds, they'll get back 70% of their Imperial creds in the local currency for local business needs purchases.
DM's
Starport A (-10%); B (-5%); C (0); D (+5%); E (+10%); & X (+15%).
So the math looks like LL + Starport DM = planetary exchange rates.
Taxation/ personal freedoms:
Government (Same 5% increment) level DM same scale: Less Govt equals less taxes,more personal freedoms just as More (higher level)govt = more taxes general/ less personal freedoms as a general rule of thumb. And placed over the planet's population as a DM (less the tax base of folk the govt can squeeze for revenues) & Starport type DM.
Population Low (0-4)= DM of -15%; Pop Middle (5-8) -10%; Pop High (9-A)= -5%
the math boils down to Govt digit + Pop DM + Starport DM (as above)
example, Govt 9 (impersonal bureaucracy)= +45% level of income taxation imposed on a world with population 5 (middle) with an A-class starport = 45% total taxation of their annual incomes there.
Another example: Planet with Govt A (Charismatic Dictatorship, or +50%), on a world with pop 4 (-15%),& has an E class starport (+10%) = an overall 45% taxation rate.
Last example: Planet with Govt. F (+75%), with a High Population A (-5%), & with a Starport C-class (+0%) for a total taxation level of 70% of the planetary citizen's annual incomes.
This is just something I cooked up off the top of my head with generalities--its adherence to RW-RL logic and examples is not be construed as concrete, but an example of how you yourself as GM can generate from the UWP/UPP digits some of the detail your player's may require.
Now in the Imperium, starport law levels tend to run from LL-1 to LL-3 (1d3), and you get into the extrality-zone issues, not yet mentioned here.
For Non-Imperial, Non-aligned worlds of course, this model above can be of some use.
Interpreting Taxation levels, & freedom levels boils down to this (IMHO only) if your a sophont, and they take more than half your pay annually in taxes there, thats one level of an intrusive goverment (without LL-C+ Paramilitary statehood).
Given the T-standard 24-hour day, and an 8hr work day model, thats 1/3 of your daily time & 16 hrs to do as you please (rest, eat, get to work, etc), or 33%. The omnipresence of govt/ freedoms can be broadly interpreted then by the taxation level--if they're taking half your wages or more, trust me the Govt on that world has invested those monies/revenues in its power structure. Likewise, if its to stay in power, it has to give the people it rules something back in return--socialized medicine, guaranteed employment, welfare, a strong military/defense (cynically seen by some as keeping them in place OVER the population, of course by outsiders), and protection from criminal elements (defined as you see fit, Oh GM!).
Thats my 0.000000125Mcr worth for ya. As always gentlemen, great ideas & discussion. 