Resistance forces sounds cool.
I think Da Boss has it covered pretty well - the core of the resistance is the judges, backed up by surviving Citi-Def and any local gang footsoldiers who've had a sudden attack of patriotism.
Short of ammo is a definite. My one concern is keeping track of weapons -
Dangerous has the benefit that it does the book-keeping for you by removing the model in question.
Not sure how to reflect it in game best; possibly reduce the attack dice of each weapon by 1 (to a minimum of 1) and no using
Spray? Judges, certainly, will know how many rounds they have left - they may be more circumspect about using them but I wouldn't expect many cases of
Click! "Oh Grud...".
Definitely give Judges access to other weapons - they'll use whatever they have. In fact, you may want to mandate this for some of them (i.e. they don't start with judicial weapons) - not many people will voluntarily take a handgun if they get a Mk2 Lawgiver as standard issue. Also, some access to earth-shattering kabooms will be needed to deal with sov-cit tanks.
Rad-Sickness was the other one, but it's fair to assume your resistance types have managed to avoid the worst or they wouldn't still be fighting. Last was those hypno-pamphlet things....not sure if that's something you'd include directly, but it might be an 'environmental hazard' - everyone (except arguably judges) would be less inclined to fight.
In fact, you might have a little pre-game table for your resistance force of 'what unpleasant stuff have the Sov-Cit forces been doing to the sector recently':
1 - Martial Law Crackdown: Everyone is 'Short of Ammo'
2 - Radiation Poisoning: Models take a single hit on a 1 at the start of the game.
3 - Hypno-Pamphlets: All non-Judges are at -1 Will To Fight
4 - Ill-Judged Punitive Atrocities: Everyone gets +1 Will To Fight
5 - [???] Any suggestions?
The Heroes and Minions section says every model in your force listed as a hero starts at level one, but the Angel gang have higher level heroes. Do you get to add to attributes and pick talents up to their level?
I assume if a number is listed they're already 'bought up' to that level, whereas anything just listing 'hero' doesn't yet include the level 1 buffs. Otherwise Dredd is even scarier than I thought he was!