Howdy! While I appreciate the enthusiasm for the Trailmarkers system, there are no plans for it to be more extensive than it currently is (except for adding a "Killigan's personality" question soon, that's been a common request).
Your first point would require an EXTREME amount of extra effort to dig through the script for every single choice in the game, implement them into the Trailmarkers questionnaire-style system, deliberate upon certain edge cases or outcomes, and then probably miss at least a few if it were ever implemented.
Your second point is less extreme, but still goes against what the Trailmarkers system is intended to be.
If you lost your saves or had to switch devices since you last played, but want to catch back up fast without much fuss, that's what this system is intended for! It loads you into a pre-determined spot with a default setup for Killigan, with all story-necessary items obtained, and (optionally) puts you on the romance route for whichever partner you want to romance! It's also pretty handy if you want to check how a scene would've played out if you were romancing someone else, or just want to see what Killigan gets up to as a single man.
Long story short, the Trailmarkers system is more akin to a chapter select for KT than something like a built-in cheat engine. There are no plans to extend the functionality of the Trailmarkers system, because this already IS the quick catch-up system.
(I also recommend playing on a computer if you want to preserve saves, builds for mobile have been notoriously unreliable with retaining saves, especially after a new version releases)