As Wakizaka has said, out of fight mobs tend to have rather high Heal Deltas, and so re-concealing to break the fight and reuse Aimed Shot would have drawbacks,
I also think giving Aimed Shot itself a defence check, eg Concealment Vs. Perception, and removing the need for hiding
would reduce the benefits of Concealment, it would also make it easier for other professions to use it.
Which is why I think:
- Aimed Shot should only be usable from concealment, in PvP and in PvM.
- The damage cap of 13k removed so it's possible to use Aimed Shot to it's fullest extent.
- A new Agent only special should be added to the Agent toolset, like Backstab is only for Shades/Adventurers, a special that can be used without hiding mid fight with similar mechanics to Aimed Shot, with either: Aimed Shot, Concealment or a combination of the two as an Attack skill, and with Perception as a defence against it.
That would mean that an Agent sneaks into position to start the fight initially to get of the devastating Aimed Shot for which there is no defence against, and follows it up with attacks that can be similarly devastating, but for which the mob/player can defend themselves against.
This would reduce the overall effect Aimed Shot has on PvP, preventing other professions from hot-swapping to Aimed Shot weapons, while not significantly reducing the Agents toolset or ability to perform Aimed Shot in PvP, while in PvM it would give Agents a useful High damage attack that can be used without the need to break aggro or stop fighting.
However, to prevent Agents from starting an Alpha with both Aimed Shot and the new special, both should lock Aimed Shot skill for the same length of time, so the Agent can use one or the other, not both.