DigiDuckyBLE Sketch uses 5590 bytes (92%) of program storage space. Maximum is 6012 bytes. Global variables use 323 bytes of dynamic memory. Restricted by this storage space, DigiDucky lacks support of special keystrokes like LEFT_SHIFT,LEFT_ALT,etc. However one can always customize the available macros according to their need, right!?

For development, I used Serial Bluetooth Terminal.
Exported configuration file for the app is here