CODEK - Configurable OLED Display Extension Keyboard

CODEK allows you to have multiple custom profiles built into a simple 10-key macro keyboard. The removable USB connection makes it easy to transport and the OLED display provides the user with information about the current mode. The number of modes are limited only by your imagination and the memory on the 32U4 (and your ability to remember so many keys!)
To preserve the life of the OLED display, it is currently on a 5 second timeout, feel free to adjust this value as you prefer.
The keyboard can be reprogrammed anytime over the microUSB connection to add functionality or adjust performance.

A little video: https://youtu.be/Jc6TNGr77T0
ASMR clip: https://youtu.be/e1d8Fzyd_ro

I had a 0.96" OLED Display and an ATTiny85, that started the project, but it ended up with an Arduino 32U4 based board and a couple of mods.I have used many different little tricks to get this to work, somethings are not ideal. The shift registers and display run on the same clock and data lines, requirin