Demigod targeting
This has probably been brought up many times before, but just wanted to throw in my two cents. Targeting demigods (sometimes even yourself) can be difficult in a thick of a melee. This has become really apparent when trying out Sedna. I love her Healing ability and her playstyle, honestly she will probably be what I play when the game goes live. However, it is very very difficult to target a friendly moving demigod with a heal when they need it most.
I would suggest a HUD that displays your allied Demigod's, similar to a party window display in an MMO. Icons along the left side of the screen each representing one of your allies, and a healthbar underneath. You should be able to activate your heal and use the portrait as a target, if the demigod is in range.
I think this will go a long way to making Sedna more playable.