Why? Do you really still see Tribuanl as the blue clad police officers on the street corner as opposed to Denzel Washingtion in Training Day? To me, order is what they Tribunal says - and they've been given the authority re cabal powers, guards in towns etc to back it up.
L-A
Order and Law are supposedly 'Blind.' That being said, being overly easy on one sect of people, i.e. your allies, would be counter intuitive. I think beneficial perks can be given without giving your allies a 'get out of jail quicker' card. Allies of the Tribunal shouldn't be breaking the law to begin with.
Just think of Cops.
They will many times turn a blind eye for less crimes in pursuit of worse offenders.
Even Judge Dread will do it.
The beauty of the law is that it can be changed. If some cabal is allied with Tribunal, they are expected to pull their own weight into the defense of cities. So the Codex can be changed to allow allies to patrol the cities with their weapons drawn.
Town guards, walk around with Polearms/Spears in hand. Not sheathed on their back.
Allowing them to capture criminals is nice. But better would be to allow them to testify and count as two lawful witnesses even if they are not lawful. Such wonderful possibilities. The beauty of law is that it can be irrational and unjust as long as you keep to the letter of the law. It doesn't matter if a crime was committed, what matters is that an ally told you someone did, and if hes an ally then he must be right.
Perhaps even grant allies access to all guilds and clan halls. That would be neat.
Savants
Savants allies could get increased Mana gain.
And teach their allies to recite scrolls. At 50% fail rate 
In my opinion scrolls available are pretty tame. And the good ones are rare, but meeles need the rare spots for weapons, and 50% fail rate will limit use of said rare scrolls.
You can even have an emote with a little mage apprentice poping up and reciting the scroll for you. Or just you trying to read it with extreme difficulty.
Warmaster
Warmsters should improve the armies/raiders of said cabal. Or at least make them cheaper (easier to code).
And access to mercy, so that they can gloat on kills.
Knights
As someone said, free mounts!!!
And perhaps increased HP regen. As an added bonus, not an multiplier. No need to aid ogres.
Watcher
Something to do with forest.
Perhaps don't lose satiation on forest rooms. (food)
Free butcher skill. "Cut". So that you learn how to cut a corpse for some food.
The camp skill, without Camo. That would be neat.
Herald
Tome access anywhere.
As someone said, limited access to relics.
Shop discount, because everyone loves a herald and their friends.
Question:
This top3 non buyout thing applies to gold bounties, or just to CP bounties?
Is it a top3x2 or a Top0+3.