Personally I think there's a reason why cure doesn't have a combo, it just wouldn't make any sense. The reason why one chooses to use Cure over Cura is based on the flow of combat and how much the target may need to be cured by. Plus the recast times are 5 seconds each and when compared to other combos in the game the 2nd move is usually on a 30+ second recast timer. If they did turn it into a combo then they'd have to change Cura to 30 seconds recast, but it would greatly hinder the ability of a conjurer so I kinda doubt they would have any plans to implement this idea lol.