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The idea sounds nice, use the new feature and is a bit historic, the effect can look powerfull but we need at least that to make it usefull.
You need to check, VisionSharing/Duration is iirc to be modified for the ennemy traders (the bribed unit) isn't it? (check it, I am lazy to do it :p)
Can you detailed the choosen name? (I didn't succeed to translate it, it's latin or english?)

The aura name is in Latin and its: Arbiter Romae
It means "Arbiter of Rome" addressing to his ability to oversee the map with metal by bribing enemy units to carrefully plan diplomatic actions or declarations of war in case.
Indeed it seems powerful and most of times, simply boosting own troops isn't always the best strategy expecially in team games where the teamplay makes the difference in game.
There is a Duration entry to define the time the spied unit will share the Vision Range.
In order to implement the aura that will cover own traders from enemy bribing (it will simply not share vision due no bribable units found) is probably enough a function that temporary changes the VisionSharing/Bribable entry of own traders from true to false.

In D345#13460, @Grugnas wrote:

There is a Duration entry to define the time the spied unit will share the Vision Range.
In order to implement the aura that will cover own traders from enemy bribing (it will simply not share vision due no bribable units found) is probably enough a function that temporary changes the VisionSharing/Bribable entry of own traders from true to false.

Yes, I speak too fast it seems.
EDIT: It's ok, I checked, I was confused because there are different ways to get the duration of the spy.

The @Hannibal_Barca diff description should be imo used and merged with the History entry (I mean check and rewrite the History part and include that thing).

Looking at design docs again (and forum archives),
perhaps we can only make marcellus aura for cavalry and scipio a really powerfull attack one for all kind of units but with a close range (~10).
So similar 'attack effect' but a real choice.

(Here is the ref: https://trac.wildfiregames.com/wiki/Civ%3A_Romans_Republican?version=1#HEROES)

Good suggestion.

In addition I'd like Scipio Africanus to weaken enemy war elephants, since one of his great ideas was to prepare traps for them during the battle of Zama, rendering them quite useless.

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In D345#20404, @Grugnas wrote:

-Actually spear cavalry isn't as strong in battlefield as in raiding, expecially Roman cavalry which has no extra techs. Having more heroes affecting units damage, would simply let players choice the most relevant one.

What do you mean by relevant here?

-I can't quantify low range for an eventual Scipio aura since 30 mts would be enough for skirmishers to take advantage from the bonus and they are the main damage source expecially against champions.

I wrote ~10.

• Having heroes to promote different strategies will avoid eventual unused heroes rather than promoting different units spam

Did I ever say the converse? Funny.

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In D345#20416, @fatherbushido wrote:

In D345#20404, @Grugnas wrote:

-Actually spear cavalry isn't as strong in battlefield as in raiding, expecially Roman cavalry which has no extra techs. Having more heroes affecting units damage, would simply let players choice the most relevant one.

What do you mean by relevant here?

-I can't quantify low range for an eventual Scipio aura since 30 mts would be enough for skirmishers to take advantage from the bonus and they are the main damage source expecially against champions.

I wrote ~10.

• Having heroes to promote different strategies will avoid eventual unused heroes rather than promoting different units spam

Did I ever say the converse? Funny.

Consider that all roman heroes are cavalry swordsmen units. Having an evetual really powerfull attack one for all kind of units but with a close range (~10). would already make the aura for cavalry a surplus because heroes move fast enough to get in place and affect the "right" units, expecially melee units who are easier to affect because heroes attack at melee range.
On the other hand a really strong low range aura can be strong in open fields in low scale battles only because units deployment can easly be wider than 10 mts in a medium-large scale battle, and it would affect basically melee units only which aren't the main damage output (skirmishers make difference against melee units and there are heroes who boost ranged units also thanks to their wide range) or catapults with a carefully micromanagement. Indeed champions would benefit from such aura, but consider also that citizen soldiers are prone to die in enemy territory and probably a strong armor aura would be more useful and would help citizen soldiers to get promotion instead of trying to deal the most of damage before they die.