So something that would be a nice QOL feature for arena would be the ability to click and drag your heroes around on the arena pre fight screen instead of having to move your heroes into your inventory first.  

So for instance my typical arena offense team is Skull crown (lead), Duchess, Madame and Tormin.  

However when I come across a Rotos team I want to swap my Duchess into the lead spot and replace skullcrown with Basileus. 

Instead of having to click on my whole team and move them into my inventory it would be nice to just click and drag my Duchess into the lead spot. 

The same could be said about dungeons.

Thanks!