I love custom keyboard. Very cool. But looking at the stuff he's using the keyboard for it seems to me like he might be better off with a programmable 60% kb and a trackball.
copy, paste, enter, refresh, scroll down and save are then self explanatory.
adress bar is cmd + l
switching between firefox, chrome, safari and a text editor could be function + q,w,e,r. Resizing the browser window can be done with any window management software on function + asdf.
I've got a macbook pro 15 retina and the new Macbook. Would recommend either. Though you might want to offload heavy workloads to a droplet/linode if you go for the new Macbook.