I would like to see more achievements happen and have them relay to netting the objectives.

Have some tie into occupying the train, while others can hold for actively doing enough damage for the merc, something that allows players who already have the mount to hop back in even after getting their mounts.

I think the biggest thing we need (especially considering the Frontlines changes) is a dedicated Roulette option for Rival Wings. Even if it's just Hidden Gorge for the time and Astralagos comes back later. These queues (especially on Crystal) are painful, and we NEED the support for this mode. The community is doing the best we can but we need that push from SE to make it happen more often.