There was a suggestion on another thread I read that DOL should be able to gather diadem specific treasure maps which you could use to spawn monsters. I thought that was a good idea (obviously upon leaving the instance the map would crumble or something)

Another idea I saw was that you find/get buffs for your party while gathering.

I think finding chests with additional time might be interesting to, similar to abyssea in ffxi. Although if everyone's gathering these might spawn to much, so maybe make it so you can only find a 5 min time increase every 20 mins or something.

They should add another spot on the df, id say only one since the content will die one day, then the DOL is locked to DOL jobs only (can switch freely among them) then they add the need option at least on the 210s for df. This should stop the crybagging, people can enter the job they want the 210s for, if theres none of that job that can need it then everyone can greed it as normal.