Agree with OP, my dalish would have become his agent.
Sadly the ending in regards Solas choice as well as the choice of what to do with inquisition is massively limited and set up to favour only a certain flavour of inquisitor rather than the wider roleplaying options the main game supported.
The thing about DA games is that it is going to be a long running series, stories focusing on different characters, scenarios and settings. There is a structure.. which can only work if the *destination* is linear. Your choices only matter in the *how*, but not the *what*. It all fits together like a puzzle, so the writers have no choice but to limit players' choice when it comes to major events.
For instance, let's look at Origins. It is renowned as the game that offers players so much variety.. and yet, the end result is the same regardless of what happens to the Warden and what he/she does during -- you slay the archdemon and stop the blight.
A lot of people are complaining about the loss of the Inquisitor's hand, for instance.. to me it's fitting, and while you don't have a choice, at least they have addressed and shone a light on how the story concludes. Basically what it does is tell the player that the Inquisitor won't be a major force in the future -- but perhaps doing a little "behind the scenes" work, as they are now disabled.