QMK firmware handles this natively. The best Scancode256 layer uses LT(1, KC_SPC) —tapping the spacebar types space, holding it activates layer 1 where WASD become arrows.
Barcodes get scratched, smeared, or faded. ScanCode 256 analyzes each character’s relative edge positions rather than absolute widths. Result: It can decode a Code 128 even when up to 30% of the symbol is damaged. scancode256 best
KeyTweak is the most user-friendly gateway to Scancode256. While it hides the technical details, it writes perfect Scancode Map registry entries in the background. QMK firmware handles this natively
Tenkeyless (TKL) keyboards save desk space but murder data entry speed. The best Scancode256 trick is turning 7,8,9 into Numpad7,8,9; U,I,O into 4,5,6; J,K,L into 1,2,3; and M into 0. This mimics a full numpad under your right hand. While it hides the technical details, it writes
Java Edition untranslated keys - Minecraft Wiki
This gives you low-level reliability (from Scancode256) with high-level scripting power (from AHK). That combination is the true .