If I could take one thing out of LS-RP SAMP era, moving into Rage MP: a competent, hardcore, roleplay server NEEDS something resembling a justice system. It is IMPOSSIBLE to roleplay a legal character, and build up reputation, when one corrupt cop can just throw a false charge on you - and if there isn't a justice system, there's nothing you can do about it. It's unrealistic, and it disinterests people from making legal characters - if given enough time eventually a corrupt cop will just false-charge you anyway.
Edit.
To answer your question on what I wish from PD - please, make it a standard to collect evidence that would convict one beyond a reasonable doubt, like US cops are trained to. There's many exciting ways to do this, not of course forgetting interrogating suspects for a confession, or making potential plea offers.