Personally, I never liked the idea of tying "gemstone summons" to specific trances.
I'd much prefer being able to select the ones I liked from the get-go (through a dedicated UI), similar to how blue mage does it through its spellbook (even changing the elements of their respective rite/calamity spells, as needed).
Why not simply make Refulgent Lux a 2min. buff (or better yet: until the next Solar Bahamut phase) instead?
It's not as if extending it would break the game's balance or anything, since it's a single use only action.
Anyways, here are my suggestions on "improving" summoner:
EDIT:
- Allowing us to choose which Demi to use in between each Solar Bahamut phase (Solar -> Bahamut/Phoenix -> Solar -> etc.)
- Adjusting Demi-Phoenix so it becomes a "support" alternative to Demi-Bahamut (by, say, drastically reducing the cast/recast time of Raise for its duration)
- Adjusting Physick so it scales to INT instead of MND.
- Allowing Radiant Aegis to be used on other targets as well
- Implementing a dedicated UI for changing pet glamours (instead of relying on text commands)
- Finally implementing the pet glamours of post-2.0 primals (such as Leviathan-Egi/Sapphire Leviathan), even if they worked similarly to our current ones
After giving it some thought, I came up with some further adjustments to its current actions/traits.
- Astral Flow should be learned at Lv.86, so it works exclusively with the "gemstone summons" favors
- Deathflare should no longer be tied to Astral Flow, and instead it should become its own action (learned at Lv.60), later upgrading into Enkindle Bahamut through a trait (learned at Lv.70)
- Rekindle should no longer be tied to Astral Flow (nor should it gradually restore a target's HP), and instead it should temporarily replace Raise, reducing its recast timer to 1s for Firebird Trance's duration
- Sunflare should be removed altogether, with Exodus' potency being adjusted to compensate