Custom keymapping for games?

I'm using an iPega Bluetooth controller with my HTC Desire 510. For most things it works great, but I am running into some issues with Ravensword 2. Ravensword finds my controller and connects fine, but when I start playing, certain actions can't be performed (attacking being one of them). Is there a way to custom map my controller? I'm not on a rooted phone as I can't find a reliable way to root this device.