It will really good to have a sort option when doing searches. It helps a lot to get what you're looking for. Most needed sort type, just like any case of sort : last update, rate, number of views ...
I've been using MangaRock and I am still using it because it has the best Android app with many good features like searching sorting and the most important one is notification for updates. I hope there is a plan for a mobile app for MangaDex in the future. Btw I am a mobile developer...