Could you implement a focal point feature for images in the slider and hero element. This allows to set a point anywhere in the image that will be the focus in responsive mode. It already exists in Dawn theme slider, but their slider itself sucks.
On the image Joined for example the smartphone version of this image in the slider will focus on the white guitar. I could have chosen to put the focal point on the guitar player or elsewhere.
Comin' from WP we had this in every type of slider and hero section from 3rd party plugins and it's very handy to ensure that relevant part of the image will be shown on smartphones and tablets.
Would be a great asset.