[blargey]

It’s actually less sophisticated - it’s merely the choice of what key input is reported when two keys are physically in the down position, simultaneously.

“Report last key that was activated” means that rapidly switching/alternating between, say, A and D to switch movement directions is a matter of just pressing the next key instead of coordinating the lifting of the other key.

AFAIK this has existed as an autohotkey script for a long time, but it’s so simple a legitimate hardware implementation detail can be another vector, and wouldn’t fit in the “unauthorized software” definition of cheating so needed a separate callout.