With the original dashing it is possible to customise the size & layout of the widget grid via the application.coffee script that is generated for each dashboard.
I tried lifting the version out of the dashing-rails gem and replicating within my application assets with the new values, which worked so long as config.assets.debug = true is present within the environment config, which obviously means it doesn't work in production. In production the updated code is present within application.js, but does not get executed, instead the code from the gem is executed.
Any suggestions appreciated as I've reached the limit of my abilities at this point!