Apologies if this has been suggested already, I did try to search.
The springer is the only mount that is completely eclipsed by the Skyscale (other mounts either are faster, or have specific functions). I think an option to make them relevant again would be to increase their jump height by a LOT (double/triple at least). This would have two benefits - (1) it would give them a use over the Skyscale and (2) it would just be much more impressive and fun to suddenly be launched way into the air and look around at the map below.
I don't think would break anything you can't already break with a Skyscale or a Griffon, and mostly I see this being useful for jump -> launch -> Griffon combos, but it'd just be nice to make the Springer somewhat useful again.
In terms of unlocking, I'd go with a quest similar to the underwater skimmer.
Thoughts?