Dynamic Image Resizing
It would be great if Perch could use functionality like SLIR (https://github.com/lencioni/SLIR) to make it possible to dynamically resize images when template needs change, rather than having to re-upload images in order to resize them for a new template design.
With SLIR, you upload only the full-size image, and then add variables to the image path to determine its dimensions and cropping. (So, only one image file is stored on the server, but it can be used in several different sizes throughout a website's templates.)
SLIR stores 'render' requests that are kept on the server so that subsequent users can load the previously-requested image, so that image pre-processing only happens once per image. (One potential drawback: in order for SLIR to resize images, the images need to be on the same server as the website, not in an external location like an S3 bucket.)