SE should really really implement a Raid Roulette for 24-man content which works like the PvP finder. It was asked so often, also on conventions like gamescom, E3, etc. and Square Enix never gave a good answer to that. People want this. So please do it. It's not that hard to implement.

Also a good idea would be if they added special crafting loot for the Crystal tower you usually have a hard time getting, like Scintillant Ingots, Teak Lumber etc. Just implementing that weekly where you get Aether Oil for the 230 Anima is pointless because after some time people already have their anima and they never go back to that raid. Implement something steady instead which you can always use and which is valuable at any given time, like recent HQ buff food or unique crafting ingredients that ALWAYS drop.