I'll probably think of more as soon as I go back to the game, but here's a couple ideas..

-An accessible purchase history with each offer's image as it was shown in the bank. 

 When someone has the thought "Weren't these items included in that pack?", it inevitably leads to a support ticket, extended disagreement, a refund request and a bad review which could often be avoided entirely with access to our own personal, irrefutable log. We're already spending the money, Plarium, helping us keep track of it can only benefit you.

-No more attack dance with Invaders & Ghosts!

 Those few seconds can feel like ages. Plus, it's a waste of valuable offense boost time which may be the point but please, friends... Is it really necessary?

-Merge (Upgrade) ALL Materials

One button. All materials. 

-Recall / Return ALL Marches / Garrisons

One button. All troops. 

Please and thank you!